| Identifier | Protein names | Gene names | Cross reference refseq | Length | Species |
| P70597 | Prostaglandin E2 receptor EP1 subtype; PGE receptor EP1 subtype; PGE2 receptor EP1 subtype; Prostanoid EP1 receptor; | Ptger1; | NP_001265404.1; | 405 | rat |
| Q62928 | Prostaglandin E2 receptor EP2 subtype; PGE receptor EP2 subtype; PGE2 receptor EP2 subtype; Prostanoid EP2 receptor; | Ptger2; | NP_112350.1; | 357 | rat |
| P34980 | Prostaglandin E2 receptor EP3 subtype; PGE receptor EP3 subtype; PGE2 receptor EP3 subtype; Prostanoid EP3 receptor; | Ptger3; | NP_036836.1; | 365 | rat |
| P43114 | Prostaglandin E2 receptor EP4 subtype; PGE receptor EP4 subtype; PGE2 receptor EP4 subtype; Prostanoid EP4 receptor; | Ptger4; | NP_114465.3;XP_006232058.1; | 488 | rat |
| Q5U318 | Astrocytic phosphoprotein PEA-15; 15 kDa phosphoprotein enriched in astrocytes; | Pea15; | NP_001013249.1; | 130 | rat |
| P31044 | Phosphatidylethanolamine-binding protein 1; PEBP-1; 23 kDa morphine-binding protein; HCNPpp; P23K; [Cleaved into: Hippocampal cholinergic neurostimulating peptide (HCNP)]; | Pebp1; Pbp Pebp; | NP_058932.1; | 187 | rat |
| Q3SWT0 | Platelet endothelial cell adhesion molecule; PECAM-1; CD antigen CD31; | Pecam1; Pecam; | NP_113779.1; | 678 | rat |
| Q9WVK3 | Peroxisomal trans-2-enoyl-CoA reductase; TERP; EC 1.3.1.38; PX-2,4-DCR1; Peroxisomal 2,4-dienoyl-CoA reductase; RLF98; | Pecr; | NP_579833.1; | 303 | rat |
| Q2M1K5 | PC-esterase domain-containing protein 1B; Protein FAM113B; | Pced1b; Fam113b; | NP_001034543.1;XP_008763961.1;XP_008763962.1;XP_008763963.1;XP_008763964.1;XP_008763965.1;XP_008763966.1; | 432 | rat |
| Q641Z8 | Peflin; PEF protein with a long N-terminal hydrophobic domain; Penta-EF hand domain-containing protein 1; | Pef1; | NP_001007652.1; | 283 | rat |
| Q5XIP1 | Protein pelota homolog; EC 3.1.-.-; | Pelo; | NP_001007635.1; | 385 | rat |
| Q56B11 | Proline-, glutamic acid- and leucine-rich protein 1; Modulator of non-genomic activity of estrogen receptor; | Pelp1; Mnar; | NP_001019441.2; | 1130 | rat |
| Q08388 | Phosphatidylethanolamine N-methyltransferase; PEAMT; PEMT; EC 2.1.1.17; EC 2.1.1.71; | Pemt; Pempt; | NP_037135.1; | 199 | rat |
| Q6QI68 | Gamma-secretase subunit PEN-2; Liver regeneration-related protein LRRGT00140; Presenilin enhancer protein 2; | Psenen; | NP_001008764.1;XP_006228832.1; | 101 | rat |
| P04094 | Proenkephalin-A; [Cleaved into: Synenkephalin; Met-enkephalin (Opioid growth factor) (OGF); PENK(114-133); PENK(143-185); Met-enkephalin-Arg-Gly-Leu; Leu-enkephalin; PENK(239-260); Met-enkephalin-Arg-Phe]; | Penk; Penk-rs Penk1; | NP_058835.1;XP_006237897.1; | 269 | rat |
| P04073 | Gastricsin; EC 3.4.23.3; Pepsinogen C; | Pgc; | NP_579818.1; | 392 | rat |
| Q5I0D7 | Xaa-Pro dipeptidase; X-Pro dipeptidase; EC 3.4.13.9; Imidodipeptidase; Peptidase D; Proline dipeptidase; Prolidase; | Pepd; | NP_001009641.1; | 492 | rat |
| Q8CHI5 | Period circadian protein homolog 1; rPER1; Circadian clock protein PERIOD 1; | Per1; | NP_001029297.1;XP_006246675.1;XP_006246676.1; | 1293 | rat |
| Q9Z301 | Period circadian protein homolog 2; rPER2; Circadian clock protein PERIOD 2; | Per2; | NP_113866.1;XP_006245538.1;XP_006245539.1; | 1257 | rat |
| Q8CJE2 | Period circadian protein homolog 3; rPER3; Circadian clock protein PERIOD 3; | Per3; | NP_076468.2; | 1119 | rat |
