Peptide Hydrolases nonhuman 18 animal cell 14 article 14 priority journal 14 controlled study 12 Support, Non-U.S. Gov't 10 metabolism 10 peptide hydrolase 10 Animal 8 Animals 8 Male 8 enzyme activity 8 proteinase 8 radioisotope 8 Article 6 chemistry 6 human 6 trypsin 6 Cercopithecus aethiops 4 Cytoplasm 4 Glycoproteins 4 Humans 4 Mice 4 Peptides 4 Proteins 4 Rats 4 Trypsin 4 Vero Cells 4 cytology 4