| Proteinase 3 | 27.807 | UniProtKB |
| Protein-glutamine gamma-glutamyltransferase 2 | 77.329 | UniProtKB |
| Prothrombin Fragment 1/2 | 42 | Found via general search |
| Protoheme | 0.6165 | UniProtKB |
| Protoporphyrin IX | 0.5627 | UniProtKB |
| P-tau (phosphorylated tau) | 79 | Found via general search |
| PUFA (Polyunsaturated Fatty Acids) | 0.3 | Found via general search |
| Pulmonary surfactant-associated protein A1 | 26.242 | UniProtKB |
| Pyruvate | 0.08705 | UniProtKB |
| RANKL (TNFSF11) | 35.478 | UniProtKB |
