| Olfactory receptor 5AK2 | OR5AK2 | Q8NH90 | 1 |
| Olfactory receptor 5AR1 (Olfactory receptor OR11-209) | OR5AR1 | Q8NGP9 | 1 |
| Olfactory receptor 5AS1 (Olfactory receptor OR11-168) | OR5AS1 | Q8N127 | 1 |
| Olfactory receptor 5AU1 (Olfactory receptor OR14-38) | OR5AU1 | Q8NGC0 | 1 |
| Olfactory receptor 5B3 (Olfactory receptor 5B13) (Olfactory receptor OR11-239) | OR5B3 OR5B13 | Q8NH48 | 1 |
| Olfactory receptor 5D14 (Olfactory receptor OR11-141) (Olfactory receptor OR11-150) | OR5D14 | Q8NGL3 | 1 |
| Olfactory receptor 5F1 (Olfactory receptor 11-10) (OR11-10) (Olfactory receptor OR11-167) | OR5F1 | O95221 | 1 |
| Olfactory receptor 5H1 (HTPCRX14) | OR5H1 | A6NKK0 | 1 |
| Olfactory receptor 5H2 (Olfactory receptor OR3-10) | OR5H2 | Q8NGV7 | 1 |
| Olfactory receptor 5K1 (HTPCRX10) (Olfactory receptor OR3-8) | OR5K1 | Q8NHB7 | 1 |
| Olfactory receptor 5L2 (HTPCRX16) (Olfactory receptor OR11-153) | OR5L2 | Q8NGL0 | 1 |
| Olfactory receptor 5M8 (Olfactory receptor OR11-194) | OR5M8 | Q8NGP6 | 1 |
| Olfactory receptor 5P2 (Olfactory receptor-like protein JCG3) | OR5P2 | Q8WZ92 | 1 |
| Olfactory receptor 5P3 (Olfactory receptor OR11-94) (Olfactory receptor-like protein JCG1) | OR5P3 | Q8WZ94 | 1 |
| Olfactory receptor 5V1 (Hs6M1-21) (Olfactory receptor OR6-26) | OR5V1 | Q9UGF6 | 1 |
| Olfactory receptor 6A2 (Olfactory receptor 11-55) (OR11-55) (Olfactory receptor 6A1) (Olfactory receptor OR11-83) (hP2 olfactory receptor) | OR6A2 OR6A1 OR6A2P | O95222 | 1 |
| Olfactory receptor 6C3 (HSA8) | OR6C3 | Q9NZP0 | 1 |
| Olfactory receptor 6C6 | OR6C6 | A6NF89 | 1 |
| Olfactory receptor 6F1 (Olfactory receptor OR1-38) | OR6F1 | Q8NGZ6 | 1 |
| Olfactory receptor 6N1 | OR6N1 | Q8NGY5 | 1 |
| Olfactory receptor 6S1 (Olfactory receptor OR14-37) | OR6S1 | Q8NH40 | 1 |
| Olfactory receptor 6V1 (Olfactory receptor OR7-3) | OR6V1 | Q8N148 | 1 |
| Olfactory receptor 6Y1 (Olfactory receptor 6Y2) (Olfactory receptor OR1-11) | OR6Y1 OR6Y2 | Q8NGX8 | 1 |
| Olfactory receptor 7C1 (Olfactory receptor 7C4) (Olfactory receptor OR19-16) (Olfactory receptor TPCR86) | OR7C1 OR7C4 | O76099 | 1 |
| Olfactory receptor 7D2 (HTPCRH03) (Olfactory receptor 19-4) (OR19-4) (Olfactory receptor OR19-10) | OR7D2 | Q96RA2 | 1 |
| Olfactory receptor 7G3 (OST085) (Olfactory receptor OR19-9) | OR7G3 | Q8NG95 | 1 |
| Olfactory receptor 8B12 (Olfactory receptor OR11-317) | OR8B12 | Q8NGG6 | 1 |
| Olfactory receptor 8D2 (Olfactory receptor OR11-303) (Olfactory receptor-like protein JCG2) | OR8D2 | Q9GZM6 | 1 |
| Olfactory receptor 8G1 (Olfactory receptor OR11-281) (Olfactory receptor TPCR25) | OR8G1 OR8G1P | Q15617 | 1 |
| Olfactory receptor 8J1 (Olfactory receptor OR11-183) | OR8J1 | Q8NGP2 | 1 |
| Olfactory receptor 8K1 (Olfactory receptor OR11-182) | OR8K1 | Q8NGG5 | 1 |
| Olfactory receptor 8U1 | OR8U1 | Q8NH10 | 1 |
| Olfactory receptor 8U9 | OR8U9 | P0C7N5 | 1 |
| Olfactory receptor 9G4 (Olfactory receptor OR11-216) | OR9G4 | Q8NGQ1 | 1 |
| Olfactory receptor, family 51, subfamily M, member 1 | OR51M1 | B2RNI9 | 1 |
| Oligodendrocyte-myelin glycoprotein | OMG OMGP | P23515 | 1 |
| Omega-amidase NIT2 (EC 3.5.1.3) (Nitrilase homolog 2) | NIT2 CUA002 | Q9NQR4 | 1 |
| Oncostatin-M (OSM) | OSM | P13725 | 1 |
| Oncostatin-M-specific receptor subunit beta (Interleukin-31 receptor subunit beta) (IL-31 receptor subunit beta) (IL-31R subunit beta) (IL-31R-beta) (IL-31RB) | OSMR OSMRB | Q99650 | 1 |
| Opalin (Oligodendrocytic myelin paranodal and inner loop protein) (Transmembrane protein 10) | OPALIN HTMP10 TMEM10 | Q96PE5 | 1 |
| Opsin-3 (Encephalopsin) (Panopsin) | OPN3 ECPN | Q9H1Y3 | 1 |
| Opticin (Oculoglycan) | OPTC OPT | Q9UBM4 | 1 |
| Orexin receptor type 2 (Ox-2-R) (Ox2-R) (Ox2R) (Hypocretin receptor type 2) | HCRTR2 | O43614 | 1 |
| Organic solute transporter subunit alpha (OST-alpha) (Solute carrier family 51 subunit alpha) | SLC51A OSTA | Q86UW1 | 1 |
| Origin recognition complex subunit 1 (Replication control protein 1) | ORC1 ORC1L PARC1 | Q13415 | 1 |
| Origin recognition complex subunit 4 | ORC4 ORC4L | O43929 | 1 |
| Origin recognition complex subunit 5 isoform 1 variant (Fragment) | 0 | Q53FC8 | 1 |
| ORM1-like protein 2 (Adoplin-2) | ORMDL2 HSPC160 MSTP095 | Q53FV1 | 1 |
| Orphan sodium- and chloride-dependent neurotransmitter transporter NTT5 (Solute carrier family 6 member 16) | SLC6A16 NTT5 | Q9GZN6 | 1 |
| Osteopetrosis-associated transmembrane protein 1 (Chloride channel 7 beta subunit) | OSTM1 GL HSPC019 UNQ6098/PRO21201 | Q86WC4 | 1 |
| Otoferlin (Fer-1-like protein 2) | OTOF FER1L2 | Q9HC10 | 1 |
| Otopetrin-1 | OTOP1 | Q7RTM1 | 1 |
| Otopetrin-3 | OTOP3 | Q7RTS5 | 1 |
| Otoraplin (Fibrocyte-derived protein) (Melanoma inhibitory activity-like protein) | OTOR FDP MIAL UNQ3054/PRO9873 | Q9NRC9 | 1 |
| OTU domain-containing protein 6B (EC 3.4.19.12) (DUBA-5) | OTUD6B DUBA5 CGI-77 | Q8N6M0 | 1 |
| Outer dense fiber protein 3B (Outer dense fiber protein 3-like protein 3) | ODF3B ODF3L3 | A8MYP8 | 1 |
| Ovarian zinc finger protein | HOZFP | Q8J028 | 1 |
| Oviduct-specific glycoprotein (Estrogen-dependent oviduct protein) (Mucin-9) (Oviductal glycoprotein) (Oviductin) | OVGP1 MUC9 OGP | Q12889 | 1 |
| Oviductin | 0 | Q86YN0 | 1 |
| Ovochymase-1 (EC 3.4.21.-) | OVCH1 | Q7RTY7 | 1 |
| Oxoeicosanoid receptor 1 (5-oxo-ETE G-protein coupled receptor) (G-protein coupled receptor 170) (G-protein coupled receptor R527) (G-protein coupled receptor TG1019) | OXER1 GPR170 TG1019 | Q8TDS5 | 1 |
| Oxygen-regulated protein 1 (Retinitis pigmentosa 1 protein) (Retinitis pigmentosa RP1 protein) | RP1 ORP1 | P56715 | 1 |
| Oxysterol-binding protein | 0 | B3KU11 | 1 |
| Oxysterol-binding protein | 0 | Q9NX98 | 1 |
| Oxysterol-binding protein | OSBPL1A hCG_2020467 | Q6GSK5 | 1 |
| Oxysterol-binding protein-related protein 10 (ORP-10) (OSBP-related protein 10) | OSBPL10 ORP10 OSBP9 | Q9BXB5 | 1 |
| P2X purinoceptor 1 (P2X1) (ATP receptor) (Purinergic receptor) | P2RX1 P2X1 | P51575 | 1 |
| P2X purinoceptor 4 (P2X4) (ATP receptor) (Purinergic receptor) | P2RX4 | Q99571 | 1 |
| P2X purinoceptor 7 (P2X7) (ATP receptor) (P2Z receptor) (Purinergic receptor) | P2RX7 | Q99572 | 1 |
| P2Y purinoceptor 1 (P2Y1) (ATP receptor) (Purinergic receptor) | P2RY1 | P47900 | 1 |
| P2Y purinoceptor 14 (P2Y14) (G-protein coupled receptor 105) (UDP-glucose receptor) | P2RY14 GPR105 KIAA0001 | Q15391 | 1 |
| PAB-dependent poly(A)-specific ribonuclease subunit 3 (hPan3) | PAN3 | Q58A45 | 1 |
| Paired box protein Pax-1 (HuP48) | PAX1 HUP48 | P15863 | 1 |
| Paired box protein Pax-7 (HuP1) | PAX7 HUP1 | P23759 | 1 |
| Paired box protein Pax-9 | PAX9 | P55771 | 1 |
| Paired mesoderm homeobox protein 2A (ARIX1 homeodomain protein) (Aristaless homeobox protein homolog) (Paired-like homeobox 2A) | PHOX2A ARIX PMX2A | O14813 | 1 |
| Palmdelphin (Paralemmin-like protein) | PALMD C1orf11 PALML | Q9NP74 | 1 |
| Palmitoyltransferase ZDHHC13 (EC 2.3.1.225) (Huntingtin-interacting protein 14-related protein) (HIP14-related protein) (Huntingtin-interacting protein HIP3RP) (Putative MAPK-activating protein PM03) (Putative NF-kappa-B-activating protein 209) (Zinc finger DHHC domain-containing protein 13) (DHHC-13) | ZDHHC13 HIP14L HIP3RP | Q8IUH4 | 1 |
| Palmitoyltransferase ZDHHC2 (EC 2.3.1.225) (Reduced expression associated with metastasis protein) (Ream) (Reduced expression in cancer protein) (Rec) (Zinc finger DHHC domain-containing protein 2) (DHHC-2) (Zinc finger protein 372) | ZDHHC2 REAM REC ZNF372 | Q9UIJ5 | 1 |
| Palmitoyltransferase ZDHHC23 (EC 2.3.1.225) (Zinc finger DHHC domain-containing protein 23) (DHHC-23) (zDHHC23) | ZDHHC23 | Q8IYP9 | 1 |
| Palmitoyltransferase ZDHHC3 (EC 2.3.1.225) (Protein DHHC1) (Zinc finger DHHC domain-containing protein 3) (DHHC-3) (Zinc finger protein 373) | ZDHHC3 ZNF373 HSD49 | Q9NYG2 | 1 |
| Palmitoyltransferase ZDHHC9 (EC 2.3.1.225) (Zinc finger DHHC domain-containing protein 9) (DHHC-9) (DHHC9) (Zinc finger protein 379) (Zinc finger protein 380) | ZDHHC9 CXorf11 ZDHHC10 ZNF379 ZNF380 CGI-89 UNQ261/PRO298 | Q9Y397 | 1 |
| Pancreatic alpha-amylase (PA) (EC 3.2.1.1) (1,4-alpha-D-glucan glucanohydrolase) | AMY2A | P04746 | 1 |
| Pancreatic lipase-related protein 3 (PL-RP3) (EC 3.1.1.3) | PNLIPRP3 | Q17RR3 | 1 |
| Pancreatic prohormone (Pancreatic polypeptide) (PP) (Obinepitide) [Cleaved into: Pancreatic hormone (PH); Pancreatic icosapeptide (PI)] | PPY PNP | P01298 | 1 |
| PANK2 protein (Fragment) | PANK2 | Q6P1K9 | 1 |
| Pantetheinase (EC 3.5.1.92) (Pantetheine hydrolase) (Tiff66) (Vascular non-inflammatory molecule 1) (Vanin-1) | VNN1 | O95497 | 1 |
| Pantothenate kinase 4 (hPanK4) (EC 2.7.1.33) (Pantothenic acid kinase 4) | PANK4 | Q9NVE7 | 1 |
| Parafibromin (Cell division cycle protein 73 homolog) (Hyperparathyroidism 2 protein) | CDC73 C1orf28 HRPT2 | Q6P1J9 | 1 |
| Paralemmin-2 | PALM2 | Q8IXS6 | 1 |
| Paraspeckle component 1 (Paraspeckle protein 1) | PSPC1 PSP1 | Q8WXF1 | 1 |
| Parkin coregulated gene protein (Molecular chaperone/chaperonin-binding protein) (PARK2 coregulated gene protein) | PACRG GLUP | Q96M98 | 1 |
| Partner and localizer of BRCA2 | PALB2 FANCN | Q86YC2 | 1 |
| PAS domain-containing protein 1 (Cancer/testis antigen 63) (CT63) (OX-TES-1) | PASD1 | Q8IV76 | 1 |
| PAS domain-containing serine/threonine-protein kinase (PAS-kinase) (PASKIN) (hPASK) (EC 2.7.11.1) | PASK KIAA0135 | Q96RG2 | 1 |
| Patatin-like phospholipase domain-containing protein 1 (EC 3.1.1.-) | PNPLA1 | Q8N8W4 | 1 |
| Patatin-like phospholipase domain-containing protein 3 (EC 3.1.1.3) (Acylglycerol O-acyltransferase) (EC 2.3.1.-) (Adiponutrin) (Calcium-independent phospholipase A2-epsilon) (iPLA2-epsilon) | PNPLA3 ADPN C22orf20 | Q9NST1 | 1 |
| Patatin-like phospholipase domain-containing protein 7 (EC 3.1.1.-) | PNPLA7 C9orf111 | Q6ZV29 | 1 |
| Patched domain-containing protein 4 | PTCHD4 C6orf138 | Q6ZW05 | 1 |
| PCNA-interacting partner (cDNA FLJ57586) | PARPBP | B4DT40 | 1 |