Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Young-Nam Park and Jun-ichi Aikawa and Makoto Nishiyama,Site-Directed Mutagenesis of Conserved Trp39 in Rhizomucor pusillus Pepsin:Possible Role of Trp39 in Maintaining Tyr75 in the Correct Orientation for Maximizing Catalytic Activity,The journal of biochemistry,0021924X,Tokyo : Japanese Biochemical Society,1997-01,121,1,118-121,https://cir.nii.ac.jp/crid/1523951030103113600,