Proteins.
D002352:Carrier Proteins; D010450:Endopeptidases; D004798:Enzymes / Q000737:chemistry; D008667:Metalloproteins; D011506:Proteins / Q000737:chemistry / Q000378:metabolism; D013329:Structure-Activity Relationship
D002352:Carrier Proteins; D004798:Enzymes; D008667:Metalloproteins; D011506:Proteins; D010450:Endopeptidases