| Pro-epidermal growth factor | 133.994 | UniProtKB |
| Progesterone | 0.3145 | UniProtKB |
| Progesterone-induced-blocking factor 1 | 89.805 | UniProtKB |
| Progranulin | 63.544 | UniProtKB |
| Proheparin-binding EGF-like growth factor | 23.067 | UniProtKB |
| Prolactin | 25.876 | UniProtKB |
| Pro-neuropeptide Y | 10.851 | UniProtKB |
| pro-NGF | 26.959 | UniProtKB |
| Pro-opiomelanocortin | 29.424 | UniProtKB |
| Propionate | 0.07307 | UniProtKB |
