strain a-7301 produced extracellular protease in a mixed amino acid medium ( composed of gly , ala , val , ile , leu , thr , ser , cys , met , phe , tyr , lys , arg , pro , his , try , asp , asn , glu , and gln at equal concentrations of 0.1 g/liter ) .
C0061472
glu
C0017797
gln