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Proteins in sonic extracts ofStreptococcus lactis were separated by starch-gel electrophoresis at high voltage. Each slab was sliced longitudinally, and half was stained for peptidases in a mixture containing a peptide, L-amino acid oxidase (snake venom), peroxidase, ando -dianisdine; the other half was stained in amido black for protein. In addition to sonic treatment, trypsin also released enzyme from acetone-treated cells. Glycyl-L-phenylalanine, L-phenylalanyl-glycine, L-alanyl-L-phenylalanine, and L-phenylalanyl-L-alanine served as substrates in characterizing the enzymes. Five different fractions of various specificities appeared in the gels. Broad-range substrate specificities were found for sonic extracts ofS. lactis, S. cremoris, S. durans , andLactobacillus acidophilus .

Fractionation of Dipeptidase Activities of Streptococcus lactis and Dipeptidase Specificity of Some Lactic Acid Bacteria