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~ 23 kDa

cDNA obtained from human fibroblast interferon beta 1a mRNA expressed in CHO cells

> 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 1a in this assay is ~ 1 U/ml

50 mM NaOAc, pH 5.5 containing 0.1% BSA 

< 1 EU/μg

Proprietary chromatography methods

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