< 1 EU per 1 ug of protein (determined by LAL method)
Activity:
The ED50 was determined by the cell proliferation assay using human TF-1 cells is < 0.5 ng/ml, corresponding to a specific activity of > 2.0 x 106 IU/mg.
Storage Buffer:
Lyophilized from sterile distilled Water up to 0.1 - 1.0 mg/ml
Storage Instruction:
Store at 4°C to 8°C for 1 week. For long term storage store at -20°C to -80°C. Aliquot to avoid repeated freezing and thawing.
This gene encodes an immunoregulatory cytokine produced primarily by activated Th2 cells. This cytokine is involved in several stages of B-cell maturation and differentiation. It up-regulates CD23 and MHC class II expression, and promotes IgE isotype switching of B cells. This cytokine down-regulates macrophage activity, thereby inhibits the production of pro-inflammatory cytokines and chemokines. This cytokine is found to be critical to the pathogenesis of allergen-induced asthma but operates through mechanisms independent of IgE and eosinophils. This gene, IL3, IL5, IL4, and CSF2 form a cytokine gene cluster on chromosome 5q, with this gene particularly close to IL4. [provided by RefSeq