Recombinant Murine IL-2 Protein
PROTP04351-2 20ug
EUR 317
Description: IL-2 is a powerful immunoregulatory lymphokine produced by T-cells in response to antigenic or mitogenic stimulation. IL-2/IL-2R signaling is required for T-cell proliferation and other fundamental functions which are essential for the immune response. IL-2 stimulates growth and differentiation of B-cells, NK cells, lymphokine activated killer cells, monocytes, macrophages and oligodendrocytes. Recombinant murine IL-2 is a 17.2 kDa protein, containing 149 amino acid residues.

Chicken IL-2 Recombinant Protein
R00387-2 5ug/vial
EUR 259
Description: Interleukin-2 (IL-2) is a cytokine produced by T-helper cells in response to antigenic or mitogenic stimulation. It is required for T-cell proliferation and other activities crucial to the regulation of the immune response. Chicken IL-2 Recombinant Protein is purified interleukin-2 produced in yeast.

IL-2 Interleukin-2 Human Recombinant Protein, His Tag
PROTP60568-2 Regular: 10ug
EUR 317
Description: Interleukin-2 Human Recombinant produced in E.Coli is a single, non-glycosylated, Polypeptide chain containing 133 amino acids fragment (21-153) having a molecular weight of 20kDa and fused with a 4.5kDa amino-terminal hexahistidine tag. _x000D_ The IL-2 His is purified by proprietary chromatographic techniques._x000D_

Recombinant Human IL-36 Beta (IL-1F8) Protein
PROTQ9NZH7-2 10ug
EUR 317
Description: The IL-1 family is comprised of 11 structurally related ligands, including recently re-named IL-36α (IL-1F6), β (IL-1F8) and γ (IL-1F9). IL-36β is highly expressed in psoriatic plaques, and at lower levels in various other tissues. IL-36β signals through the IL-1Rrp2 (IL-1R6) receptor, which is primarily expressed on certain dendritic cells. The interaction of the IL-1Rrp2 receptor with IL-36 ligands induces dendritic cell maturation and activation. IL-36β also functions as an agonist of NF-kappaB, and stimulates the production of pro-inflammatory proteins, including IL-6, IL-8, BD-2, and BD-3. Recombinant human IL-36β is a 17.3 kDa protein containing 154 amino acid residues.

IL-4
E13-015-2 50μg
EUR 505

IL-6
E13-016-2 50μg
EUR 505

Recombinant Murine IL-15 Protein
PROTP48346-2 10ug
EUR 317
Description: IL-15 is an immunomodulating cytokine that stimulates the proliferation of T lymphocytes and shares many biological properties with IL-2. IL-15 exerts its biological activites primarily on T cells. It is also essential in the development, survival and activation of NK cells. Increased expression of IL-15 has been implicated with rheumatoid arthritis, inflammatory bowl disease and diseases affiliated with retroviruses HIV and HTLV-I. Human IL-15 is biologically active on mouse cells as measured by the dose-dependent stimulation of the proliferation of mouse CTLL cells. Recombinant murine IL-15 is a 13.3 kDa protein consisting of 115 amino acid residues.

Recombinant Human IL-34 Protein
PROTQ6ZMJ4-2 10ug
EUR 317
Description: IL-34 is a homodimeric cytokine that is expressed in a range of tissues including spleen, heart, brain, liver, kidney, lung, ovary, thymus, testis, small intestine, prostate and colon. IL-34 is a ligand for colony-stimulating factor-1 receptor (CSF1R), which also binds to CSF-1. It specifically binds CD14+ monocytes, promotes survival and proliferation of human peripheral blood monocytes, and stimulates macrophage colony formation by human bone marrow cells. IL-34, like human CSF-1 stimulates phosphorylation of MAPK1/ERK2 and MAPK3/ERK1. Recombinant human IL-34 is a 52.5 kDa homodimeric glycoprotein consisting of 460 amino acid residues, including a C-terminal His-Tag.

Recombinant Murine IL-33 Protein
PROTQ8BVZ5-2 10ug
EUR 317
Description: IL-33 is a proinflammatory protein that shares structural and functional characteristics with the IL-1 cytokine family. It binds and signals through the IL-1RL1/ST2 receptor activating NF-kappaB and MAP kinases. IL-33 induces production of TH2 cell related cytokines, including IL-4, IL-5 and IL-13, and exerts multiple inflammation related bioactivities. Recombinant murine IL-33 is a 17.5 kDa protein containing 158 amino acid residues.

Recombinant Human IL-23 Protein
PROTQ9NPF7-2 10ug
EUR 317
Description: IL-23 is a proinflammatory heterodimeric protein composed of two subunits, a unique p19 subunit and a p40 subunit, which is shared with IL-12. IL-23 is secreted by activated dendritic cells and macrophages, and signals though a receptor comprised of IL-23R complexed with IL-12Rβ2. IL-23 has been shown to enhance proliferation of memory T cells. It also stimulates the production of IFN-γ in NK cells, induces IL-17 production, and drives Th17 mediated responses. Recombinant IL-23 is a 53.5 kDa heterodimeric protein consisting of two subunits, p19 (170 amino acids) and p40 (306 amino acids).*Manufactured using BTI-Tn-5B1-4 cells under license from the Boyce Thompson Institute for Plant Research, Inc.

Recombinant Human IL-33 Protein
PROTO95760-2 10ug
EUR 317
Description: Human IL-33 is a proinflammatory protein that shares structural and functional characteristics with the IL-1 cytokine family. It binds and signals through the IL-1RL1/ST2 receptor activating NF-kappaB and MAP kinases. IL-33 induces production of TH2 cell related cytokines, including IL-4, IL-5 and IL-13, and exerts multiple inflammation related bioactivities. Recombinant human IL-33 is a 17.9 kDa protein containing 159 amino acid residues.

Recombinant Murine IL-3 Protein
PROTP01586-2 10ug
EUR 317
Description: IL-3 is a hematopoietic growth factor that promotes the survival, differentiation and proliferation of committed progenitor cells of the megakaryocyte, granulocyte-macrophage, erythroid, eosinophil, basophil and mast cell lineages. Produced by T cells, mast cells and eosinophils, IL-3 enhances thrombopoieses, phagocytosis, and antibody-mediated cellular cytotoxicity. Its ability to activate monocytes suggests that IL-3 may have additional immunoregulatory roles. Many of the IL-3 activities depend upon co-stimulation with other cytokines. IL-3 is species-specific, variably glycosylated cytokine. Recombinant murine IL-3 is a 15.1 kDa globular protein containing 135 amino acid residues.

Recombinant Human IL-5 Protein
PROTP05113-2 10ug
EUR 317
Description: IL-5 is a hematopoietic growth factor that stimulates the proliferation and activation of eosinophils. Produced by mast cells, T cells, and eosinophils, IL-5 plays an important role in inducing cell-mediated immunity against parasitic infections and certain tumors. Elevated levels of IL-5 lead to Eosinophilia, which may result in the induction of asthma and other allergic diseases. Human and murine IL-5 is cross-species reactive. Recombinant human IL-5 is a 26.5 kDa disulfide-linked homodimeric protein containing two 116 amino acid chains.

Recombinant Human IL-1Ra Protein
PROTP18510-2 100ug
EUR 317
Description: Interleukin-1 receptor antagonist (IL-1RA) is a naturally occurring inflammatory inhibitor protein. It inhibits the activity of IL-1α and IL-1β by competitively blocking binding to their type I and type II receptors. IL-1Ra is produced by corneal epithelial cells, monocytes, neutrophils, macrophages, and fibroblasts. Therapeutically, IL-1Ra may help in the treatment of sepsis, cachexia, rheumatoid arthritis, chronic myelogenous leukemia, asthma, psoriasis, and inflammatory bowel disease. Recombinant human IL-1Ra is a 17.2 kDa protein consisting of 153 amino acid residues.

Recombinant Human IL-11 Protein
PROTP20809-2 10ug
EUR 317
Description: IL-11 is a multifunctional cytokine produced by stromal cells such as fibroblasts, epithelial cells and osteoclasts. It is expressed in a wide variety of tissues including thymus, lung, bone, connective tissue and central nervous system. IL-11 plays an important regulatory role in hematopoiesis by stimulating growth of myeloid, erythroid and megakaryocyte progenitor cells. It also regulates bone metabolism, inhibits production of proinflammatory cytokines and protects against gastromucosal injury. Recombinant Human IL-11 is a 19.3 kDa protein consisting of 179 amino acid residues.

Equine IL-10 Recombinant Protein
R00021-2 5ug/vial
EUR 259
Description: IL-10 is an anti-inflammatory cytokine and a member of the IL-10 family of cytokines, which have indispensable functions in many infectious and inflammatory diseases. Equine IL-10 Recombinant Protein is purified interleukin-10 produced in yeast.

Chicken IL-13 Recombinant Protein
R00077-2 5ug/vial
EUR 259
Description: IL-13 is an important mediator of allergic inflammation and disease. In addition to effects on immune cells, IL-13 is implicated as a central mediator of the physiologic changes induced by allergic inflammation in many tissues. Chicken IL-13 Recombinant Protein is purified interleukin-13 produced in yeast.

Chicken IL-6 Recombinant Protein
R00102-2 5ug/vial
EUR 259
Description: Interleukin-6 (IL-6) is an interleukin that acts as both a pro-inflammatory and anti-inflammatory cytokine. Chicken IL-6 Recombinant Protein is purified interleukin-6 produced in yeast.

Mouse IL-18 Recombinant Protein
R00124-2 5ug/vial
EUR 259
Description: Interleukin-18 (IL-18) is a proinflammatory cytokine that belongs to the IL-1 superfamily. IL-18 works together with IL-12 to induce cell-mediated immunity following infection, and IL-18 is also able to induce severe inflammatory reactions, which suggests its role in certain inflammatory disorders. Mouse IL-18 Recombinant Protein is purified interleukin-18 produced in yeast.

Dolphin IL-4 Recombinant Protein
R00230-2 5ug/vial
EUR 259
Description: IL-4 has many biological roles, including the stimulation of activated B-cell and T-cell proliferation, and the differentiation of CD4+ T-cells into Th2 cells. It is a key regulator in humoral and adaptive immunity. Dolphin IL-4 Recombinant Protein is purified interleukin-4 produced in yeast.

Equine IL-17A Recombinant Protein
R00421-2 5ug/vial
EUR 259
Description: IL-17A is a member of the IL-17 family of cytokines, whose members are involved in numerous immune regulatory functions. IL-17 induces the production of many other cytokines, chemokines, and prostaglandins. Equine IL-17A Recombinant Protein is purified interleukin-17A produced in yeast.

Catfish IL-8 Recombinant Protein
R00423-2 5ug/vial
EUR 259
Description: Interleukin-8 (IL-8), also known as CXCL8, is an ELR-positive CXC family member chemokine produced by macrophages and other cell types such as epithelial cells. ELR-positive CXC chemokines such as IL-8 specifically induce the migration of neutrophils, and interact with chemokine receptors CXCR1 and CXCR2. Catfish IL-8 Recombinant Protein is purified interleukin-8 produced in yeast.

Chicken IL-21 Recombinant Protein
R00459-2 5ug/vial
EUR 259
Description: The cytokine interleukin-21 (IL-21) regulates the proliferation and differentiation of T and B lymphocytes, modulates the cytotoxic activity and survival of NK and CD8+ T cells, and suppresses the maturation of dendritic cells. Chicken IL-21 Recombinant Protein is purified interleukin-21 produced in yeast.

Chicken IL-1ra Recombinant Protein
R00651-2 5ug/vial
EUR 259
Description: Interleukin-1 Receptor Antagonist Protein (IL-1F3, IL-1ra) belongs to the IL-1 family of cytokines, whose members play key roles in the development and regulation of inflammation. IL-1 receptor antagonist (IL-1ra; IL-1F3) reduces inflammation by blocking the binding of the agonist receptor ligands. Chicken IL-1 Receptor Antagonist Recombinant Protein is purified interleukin-1 receptor antagonist protein (IL-1F3, IL-1ra) produced in yeast.

Swine IL-22 Recombinant Protein
R00963-2 5ug/vial
EUR 259
Description: IL-22 is produced by activated DC, T cells, splenic cells, and Th17 cells, and it initiates innate immune responses against bacterial pathogens, especially in epithelial cells such as respiratory and gut epithelial cells. Swine IL-22 Recombinant Protein is purified interleukin-22 produced in yeast.

Equine IL-5 Recombinant Protein
R01086-2 5ug/vial
EUR 259
Description: The IL-5 cytokine has a key role in regulating eosinophil development and is responsible for selective terminal differentiation of eosinophils. It is associated with the cause of several allergic diseases including allergic rhinitis and asthma. Equine IL-5 Recombinant Protein is purified interleukin-5 produced in yeast.

Swine IL-17F Recombinant Protein
R02062-2 5ug/vial
EUR 259
Description: IL-17F induces the production of many other cytokines, chemokines, and prostaglandins from many cell types (fibroblasts, endothelial cells, epithelial cells, keratinocytes and macrophages). IL-17F has been shown to have a pro-inflammatory role in asthma. Swine IL-17F Recombinant Protein is purified interleukin-17F produced in yeast.

Anti-IL-1 beta Antibody
A00101-2 1mg
EUR 1232
Description: Rabbit Polyclonal IL-1 beta Antibody. Validated in IP, IHC, WB and tested in Human.

IL-1 β
E13-003-2 50μg
EUR 570

His-IL-3
E13-014-2 50μg
EUR 505

His-IL-10
E13-019-2 50μg
EUR 505

His-IL-22
E13-028-2 50μg
EUR 570

IL-1 α
E13-029-2 50μg
EUR 570

Recombinant Murine IL-1 Alpha Protein
PROTP01582-2 10ug
EUR 317
Description: IL-1α is a non-secreted proinflammatory cytokine produced in a variety of cells including monocytes, tissue macrophages, keratinocytes and other epithelial cells. Both IL-1α and IL-1β binds to the same receptor and has similar if not identical biological properties. These cytokines have a broad range of activities including, stimulation of thymocyte proliferation, by inducing IL-2 release, B-cell maturation and proliferation, mitogenic FGF-like activity and the ability to stimulate the release of prostaglandin and collagenase from synovial cells. However, whereas IL-1β is a secreted cytokine, IL-1α is predominantly a cell-associated cytokine. Recombinant murine IL-1α is an 17.9 kDa protein containing 156 amino acid residues.

Recombinant Murine IL-1 Beta Protein
PROTP10749-2 10ug
EUR 317
Description: IL-1β is a proinflammatory cytokine produced in a variety of cells including monocytes, tissue macrophages, keratinocytes and other epithelial cells. Both IL-1α and IL-1β binds to the same receptor and has similar if not identical biological properties. These cytokines have a broad range of activities including, stimulation of thymocyte proliferation, by inducing IL-2 release, B-cell maturation and proliferation, mitogenic FGF-like activity and the ability to stimulate the release of prostaglandin and collagenase from synovial cells. However, whereas IL-1β is a secreted cytokine, IL-1α is predominantly a cell-associated cytokine. Recombinant murine IL-1β is a 17.5 kDa protein containing 153 amino acid residues.

Recombinant Rat IL-1 Alpha Protein
PROTP16598-2 10ug
EUR 317
Description: IL-1α is a non-secreted proinflammatory cytokine produced in a variety of cells including monocytes, tissue macrophages, keratinocytes and other epithelial cells. Both IL-1α and IL-1β binds to the same receptor and has similar if not identical biological properties. These cytokines have a broad range of activities including, stimulation of thymocyte proliferation, by inducing IL-2 release, B-cell maturation and proliferation, mitogenic FGF-like activity and the ability to stimulate the release of prostaglandin and collagenase from synovial cells. However, whereas IL-1β is a secreted cytokine, IL-1α is predominantly a cell-associated cytokine. Recombinant rat IL-1α is a 17.7 kDa protein containing 155 amino acid residues.

Dolphin IL-1 beta Recombinant Protein
R00101-2 5ug/vial
EUR 259
Description: IL-1 beta (IL-1β) is a member of the interleukin 1 family of cytokines. The IL-1 beta cytokine is produced by activated macrophages as a proprotein, which is proteolytically processed to its active form by caspase 1 (CASP1/ICE). This cytokine is an important mediator of the inflammatory response, and is involved in a variety of cellular activities, including cell proliferation, differentiation, and apoptosis. Dolphin IL-1 beta Recombinant Protein is purified interleukin-1 beta cytokine produced in yeast.

Guinea Pig IL-15 Recombinant Protein
R00212-2 5ug/vial
EUR 259
Description: Interleukin-15 (IL-15) is a cytokine with structural similarity to IL-2 that is secreted by mononuclear phagocytes following infection by virus(es). This cytokine induces cell proliferation of natural killer cells. Guinea Pig IL-15 Recombinant Protein is purified interleukin-15 produced in yeast.

Dolphin IL-1 alpha Recombinant Protein
R01144-2 5ug/vial
EUR 259
Description: IL-1 alpha (IL-1α, IL-1F1) is a member of the interleukin 1 family of cytokines. IL-1 alpha is an inflammatory cytokine active in the initiation of the inflammatory reaction and in driving Th1 and Th17 inflammatory responses. Dolphin IL-1 alpha Recombinant Protein is purified interleukin-1 alpha cytokine produced in yeast.

Equine IL-12 p40 Recombinant Protein
R01152-2 5ug/vial
EUR 259
Description: The IL-12 p40 subunit, or interleukin-12 beta subunit, is the 40 kD cytokine receptor-like subunit of the heterodimeric cytokines IL-12 and IL-23. IL-12 is involved in the differentiation of naive T cells into Th1 cells and the growth and function of T cells. Both IL-23 and IL-12 can activate the transcription activator STAT4 and stimulate the production of interferon-gamma (IFNG). Equine IL-12 p40 Recombinant Protein is purified interleukin-12 p40 produced in yeast.

Recombinant Rat IL-13 (109 a.a.) Protein
PROTP42203-2 10ug
EUR 317
Description: IL-13 is an immunoregulatory cytokine produced primarily by activated Th2 cells, and also by mast cells and NK cells. Targeted deletion of IL-13 in mice resulted in impaired Th2 cell development and indicated an important role for IL-13 in the expulsion of gastrointestinal parasites. IL-13 exerts anti-inflammatory effects on monocytes and macrophages and it inhibits the expression of inflammatory cytokines such as IL-1β, TNF-α, IL-6 and IL-8. IL-13 has also been shown to enhance B cell proliferation and to induce isotype switching resulting in increased production of IgE. Blocking of IL-13 activity inhibits the pathophysiology of asthma. Human and murine IL-13 is cross-species reactive. Recombinant rat IL-13 is an 11.9 kDa protein consisting of 109 amino acid residues.

IL-7 Interleukin-7 Human Recombinant Protein
PROTP13232-2 Regular: 10ug
EUR 317
Description: Interleukin-7 Human Recombinant produced in E.Coli is a single, non-glycosylated polypeptide chain containing 152 amino acids and having a molecular mass of 17.4 kDa. ;The IL-7 is purified by proprietary chromatographic techniques.

IL-10 Interleukin-10 Human Recombinant Protein
PROTP22301-2 Regular: 10ug
EUR 317
Description: Interleukin-10 Human Recombinant produced in E.coli is a single non-glycosylated polypeptide chains containing 161 amino acids each and having a molecular mass of 18.6kDa.;The IL-10 is purified by proprietary chromatographic techniques.

IL-2
E21-013 10ug
EUR 343

IL-2
E21-D66 10ug
EUR 343

IL-2
E21-K24 10ug
EUR 343

IL-2
E13-013-1 10μg
EUR 161

IL-2
MO15069 500 ug
EUR 910

IL-22 Interleukin-22 Mouse Recombinant Protein, Pegylated
PROTQ9JJY9-2 Regular: 10ug
EUR 317
Description: Pegylated Interleukin-22 Mouse Recombinant produced in E.Coli is a single, non-glycosylated homodimeric polypeptide chain containing 147 amino acids and an aditional Ala amino acid at N-terminus having a molecular mass of 36 kDa as determioned by mass spectometry. However due to enlarged hydrodymanic volume it runs on the SDS-PAGE as a 50 kDa protein and in gel-filtration on Superdex 200 as over 200 kDa protein._x000D_ The Murine IL-22 is Mono-pegylated (with 20 kDa PEG) purified by proprietary chromatographic techniques. _x000D_

IL-4 Interleukin-4 Human Recombinant Protein, CHO
PROTP05112-2 Regular: 10ug
EUR 317
Description: Interleukin-4 Human Recombinant produced in CHO is a single, non-glycosylated polypeptide chain containing 129 amino acids and having a molecular mass of 14 kDa, the glycosilation of IL-4 migrates as 18 kDa on SDS-PAGE.;The IL-4 is purified by proprietary chromatographic techniques.

IL-6 Interleukin-6 Recombinant Protein Human, CHO
PROTP05231-2 Regular: 20ug
EUR 317
Description: Interleukin-6 Human Recombinant produced in CHO is a 21-23kDa single, glycosylated polypeptide chain containing 183 amino acids.

IL-6 Interleukin-6 Mouse Recombinant Protein, Sf9
PROTP08505-2 Regular: 10ug
EUR 317
Description: Interleukin-6 Mouse Recombinant produced in Sf9 Baculovirus cells is a single, glycosylated polypeptide chain containing 193 amino acids (25-211a.a.) and having a molecular mass of 22.5kDa (Molecular size on SDS-PAGE will appear at approximately 18-28kDa). IL6 is expressed with a 6 amino acid His tag at C-Terminus and purified by proprietary chromatographic techniques.

IL-3 Interleukin-3 Human Recombinant Protein, Sf9
PROTP08700-2 Regular: 10ug
EUR 317
Description: Interleukin-3 Human Recombinant produced in insect cells is a single, glycosylated polypeptide chain containing 133 amino acids and having a molecular mass of 15000 Dalton. ;The IL-3 CSF is fused to a C-terminal His-tag (6x His) and purified by proprietary chromatographic techniques.

IL-9 Interleukin-9 Human Recombinant Protein, Sf9
PROTP15248-2 Regular: 10ug
EUR 317
Description: IL-9 produced in Sf9 Baculovirus cells is a single, glycosylated polypeptide chain (19-144 a.a.) including an 18 aa signal peptide (1-18 aa) and fused to a 6 aa His Tag at C-terminus containing a total of 150 amino acids and having a molecular mass of 14.5kDa.;IL9 shows multiple bands between 18-28kDa on SDS-PAGE, reducing conditions and purified by proprietary chromatographic techniques.

IL-16 Interleukin-16 Human Recombinant Protein, His Tag
PROTQ14005-2 Regular: 25ug
EUR 317
Description: Interleukin-16 Human Recombinant produced in E.Coli is a single, non-glycosylated polypeptide chain (502-631 a.a) containing 150 amino acids and having a molecular mass of 15.5kDa. The IL-16 is fused to a 20 a.a His-Tag at N-Terminus.;The IL-16 is purified by proprietary chromatographic techniques.

IL-17 Interleukin-17 Human Recombinant Protein, His Tag
PROTQ16552-2 Regular: 10ug
EUR 317
Description: Interleukin-17A Human Recombinant produced in E.Coli is a single, non-glycosylated, Polypeptide chain containing 132 amino acids fragment (24-155) having a molecular weight of 19.62kDa and fused with a 4.5kDa amino-terminal hexahistidine tag. ;The IL-17A His is purified by proprietary chromatographic techniques.

IL-29 Interleukin-29 Human Recombinant Protein, His Tag
PROTQ8IU54-2 Regular: 20ug
EUR 317
Description: IL 29 Human Recombinant produced in E.Coli is a single, non-glycosylated polypeptide chain containing 206 amino acids (20-200 a.a) and having a molecular mass of 22.7kDa.IL 29 is fused to a 23 amino acid His-tag at N-terminus & purified by proprietary chromatographic techniques.

IL-28A Interleukin-28A Human Recombinant Protein, His Tag
PROTQ8IZJ0-2 Regular: 10ug
EUR 317
Description: IL 28A Human Recombinant produced in E.Coli is a single, non-glycosylated polypeptide chain containing 198 amino acids (26-200 a.a.) and having a molecular mass of 22.1kDa. IL 28A is fused to a 23 amino acid His-tag at N-terminus & purified by proprietary chromatographic techniques.

IL-12-p40 Interleukin-12 p40 Human Recombinant Protein
PROTP29460-2 Regular: 10ug
EUR 317
Description: Interleukin-12 p40 His Human Recombinant produced in E.Coli is single, a non-glycosylated, polypeptide chain containing 306 amino acids fragment (23-328) with an amino-terminal hexahistidine tag. ;The IL-12 p40 His is purified by proprietary chromatographic techniques.

IL-13-Variant Interleukin-13 Variant Human Recombinant Protein
PROTP35225-2 Regular: 10ug
EUR 317
Description: Interleukin-13 Variant Human Recombinant produced in E.Coli is a single, non-glycosylated polypeptide chain containing 114 amino acids, with a substitution of Q for R at position 112 compared with the wild type IL-13, having a molecular mass of 12.5 kDa. ;The IL-13 Variant is purified by proprietary chromatographic techniques.