Produced by macrophages, IFN-alpha have antiviral activities. Recombinant protein corresponding to aa24-188 from human Interferon alpha-2, expressed in E.coli. Molecular Weight: ~19.4kD Biological Activity: The ED50 as determined by a viral resistance assay using VSV-WISH cells is less than 10pg/ml. Amino Acid Sequence: CDLPQTHSLGSRRTLMLLAQMRRISLFSCLKDRHDFGFPQEEFGNQFQKAETIPVLHEMIQQIFNLFSTKDSSAAWDETLLDKFYTELYQQLNDLEACVIQGVGVTETPLMKEDSILAVRKYFQRITLYLKEKKYSPCAWEVVRAEIMRSFSLSTNLQESLRSKE Storage and Stability: Lyophilized and reconstituted products are stable for 6 months after receipt at -20C. Reconstitute with sterile ddH2O. Aliquot to avoid repeated freezing and thawing. Store at -20C. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap. Further dilutions can be made in assay buffer.