Trypsin is a member of the serine protease family. Trypsin cleaves peptides on the C-terminal end of lysine and arginine amino acid residues. SAB recombinant human trypsin is a genetically engineered protein expressed in E.coli and the amino acid sequence is identical to human pancreas-derived trypsin,with equivalent properties compared to native trypsin .The enzyme is inhibited by serine protease inhibitors, e.g. PMSF,soybean trypsin inhibitor and by metal chelating agents, e.g.EDTA.