Inhibits papain and cathepsin L but with affinities lower than other cystatins. May play a role in immune regulation through inhibition of a unique target in the hematopoietic system. Source: Recombinant protein corresponding to aa19-144 from mouse Cystatin-F, fused to 10X His-Tag at N-terminal and Myc-Tag at C-terminal, expressed in E.coli. Molecular Weight: ~20.5kD Amino Acid Sequence: ARPPDFCSKDLISSVKPGFPKTIETNNPGVLKAARHSVEKFNNCTNDIFLFKESHVSKALVQVVKGLKYMLEVKIGRTTCRKTMHHQLDNCDFQTNPALKRTLYCYSEVWVIPWLHSFEVPVLLCQ Storage and Stability: May be stored at 4C for short-term only. Aliquot to avoid repeated freezing and thawing. Store at -20C. Aliquots are stable for 6 months after receipt 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.