| Identifier | Protein names | Gene names | Cross reference refseq | Length | Species |
| Q2KIP5 | PDZK1-interacting protein 1; | PDZK1IP1; | NP_001039986.1;XP_005204902.1; | 114 | cow |
| Q32KW7 | PDZ domain-containing protein 9; | PDZD9; | NP_001069562.1; | 263 | cow |
| P34979 | Prostaglandin E2 receptor EP3 subtype; PGE receptor EP3 subtype; PGE2 receptor EP3 subtype; Prostanoid EP3 receptor; | PTGER3; | NP_851375.1;XP_005204499.1;XP_005204501.1; | 417 | cow |
| Q8MJ08 | Prostaglandin E2 receptor EP4 subtype; PGE receptor EP4 subtype; PGE2 receptor EP4 subtype; Prostanoid EP4 receptor; | PTGER4; | NP_777014.1; | 492 | cow |
| P13696 | Phosphatidylethanolamine-binding protein 1; PEBP-1; Basic cytosolic 21 kDa protein; HCNPpp; [Cleaved into: Hippocampal cholinergic neurostimulating peptide (HCNP)]; | PEBP1; PBP PEBP; | NP_001028795.1; | 187 | cow |
| P51866 | Platelet endothelial cell adhesion molecule; PECAM-1; CD antigen CD31; | PECAM1; | NULL | 739 | cow |
| A6QL70 | PC-esterase domain-containing protein 1B; Protein FAM113B; | PCED1B; FAM113B; | NP_001094677.1;XP_005206453.1;XP_005206454.1;XP_005206455.1;XP_005206456.1;XP_005206457.1;XP_005206458.1;XP_005206459.1;XP_005206460.1; | 437 | cow |
| Q95121 | Pigment epithelium-derived factor; PEDF; Serpin F1; | SERPINF1; PEDF; | NP_776565.1; | 416 | cow |
| Q6H236 | Paternally-expressed gene 3 protein; | PEG3; | NULL | 2387 | cow |
| Q58DV0 | Protein pelota homolog; EC 3.1.-.-; | PELO; | NP_001029738.1;XP_005221579.1; | 385 | cow |
| Q7YRH6 | Phosphatidylethanolamine N-methyltransferase; PEAMT; PEMT; EC 2.1.1.17; EC 2.1.1.71; PEMT2; | PEMT; PEMT2; | NP_892034.1; | 199 | cow |
| Q5G235 | Gamma-secretase subunit PEN-2; Presenilin enhancer protein 2; | PSENEN; PEN2; | NP_001008669.1; | 101 | cow |
| P01211 | Proenkephalin-A; [Cleaved into: Synenkephalin; Met-enkephalin (Opioid growth factor) (OGF); PENK(111-130); PENK(140-179); Met-enkephalin-Arg-Gly-Leu; Leu-enkephalin; Enkelytin; PENK(233-254); Met-enkephalin-Arg-Phe]; | PENK; | NP_776566.1; | 263 | cow |
| P00792 | Pepsin A; EC 3.4.23.1; | PGA; | NP_001001600.2; | 372 | cow |
| A6QQJ3 | Peripherin; | PRPH; | NP_001095848.1; | 469 | cow |
| P80025 | Lactoperoxidase; LPO; EC 1.11.1.7; | LPO; | NP_776358.1;XP_005219930.1; | 712 | cow |
| A5D7L8 | PGC-1 and ERR-induced regulator in muscle protein 1; PPARGC1 and ESRR-induced regulator in muscle 1; Peroxisome proliferator-activated receptor gamma coactivator 1 and estrogen-related receptor-induced regulator in muscle 1; | PERM1; | NP_001091517.1;XP_005217147.1; | 901 | cow |
| A4FUD4 | Peroxisome assembly protein 12; Peroxin-12; | PEX12; | NULL | 359 | cow |
| Q0P5B1 | Peroxisomal membrane protein PEX13; Peroxin-13; | PEX13; | NP_001069680.1; | 403 | cow |
| Q2KII7 | Peroxisomal membrane protein PEX16; Peroxin-16; Peroxisomal biogenesis factor 16; | PEX16; | NP_001068917.1;XP_005216504.1; | 328 | cow |
