Publication PMID: 1512263Lin XL, Lin YZ, Koelsch G, Gustchina A, Wlodawer A, Tang J. Enzymic activities of two-chain pepsinogen, two-chain pepsin, and the amino-terminal lobe of pepsinogen. J Biol Chem 267:17257-63, 1992 August, PMID: 1512263