Z-LEU-LEU-LEU-FMK

Cathepsin L is a lysosomal cysteine proteinase th at metabolizes collagens and elastins. The roles and activity of Cathepsin L can be studied with the aid of peptide inhibitors such as the pentapeptide amide RKLLW-NH2 (Arg-Lys-Leu-Leu-Trp-NH2).