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20 kDa

cDNA obtained from human fibroblast interferon beta mRNA expressed in E.coli

> 95% by SDS-PAGE stained by Coomassie Blue
Endotoxin level < 1 EU/μg

Measured using a cytopathic inhibition assay on human lung carcinoma cell line A549 with encephalomyocarditis virus (EMCV). EC50 for IFN beta 1b in this assay is ~ 1 U/ml

153 mM NaCl, 1.3% Normal Serum Albumin 

< 1 EU/μg

For retention of full activity store at -70 ºC or below and avoid repeated freeze-thaw cycles