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32 kDa

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

Measured by neutralization of interferon in cytopathic effect inhibition assay.

Does not neutralize mouse IFN beta, human IFN gamma, human IFN lambda 1, human IFN lambda 2, human IFN lambda 3, or rat IFN alpha 14 when tested at ≥ 100X the typical neutralizing dose.

Phosphate buffered saline (PBS) containing 0.1% bovine serum albumin (BSA)

< 1 EU/μg

A combination of ion exchange and size exclusion chromatography

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