Enzyme. Procathepsin K, rat recombinant, predominant proteinase responsible for the resorption of the bone matrix, Source: E. coli, Purity: G95%, (23.5 kDa) by proteolytic cleavage of its 99-amino-acid propeptide domain, Synonyms: CTSK, CTSO, CTSO3, Storage: -80 degree C, Pack Size: 10ug