1. Pepsinogen A (also called pepsinogen I)

2. Pepsinogen B

3. Progastricsin (also called pepsinogen II and pepsinogen C)

4. Prochymosin (also called prorennin)

5. Pepsinogen F (also called pregnancy-associated glycoprotein).

• Kageyama T (February 2002). “Pepsinogens, progastricsins, and prochymosins: structure, function, evolution, and development”. Cellular and Molecular Life Sciences. 59 (2): 288–306. doi:10.1007/s00018-002-8423-9. PMID 11915945. S2CID 8907522.