Endoproteinase Lys-C, Sequencing Grade, can be used for specific cleavage of peptides.Endoproteinase Lys-C, Sequencing Grade, is a widely used serine protease, that specifically hydrolyzes amide, ester, and peptide bonds at the carboxylic side of lysin. Endoproteinase Lys-C is isolated from Lysobacter enzymogenes and is supplied as a lyophilizate.