| Probable phospholipid-transporting ATPase IB (EC 3.6.3.1) (ATPase class I type 8A member 2) (ML-1) | ATP8A2 ATPIB | Q9NTI2 | 1 |
| Probable phospholipid-transporting ATPase IG (EC 3.6.3.1) (ATPase IQ) (ATPase class VI type 11C) | ATP11C ATPIG ATPIQ | Q8NB49 | 1 |
| Probable phospholipid-transporting ATPase IIB (EC 3.6.3.1) (ATPase class II type 9B) | ATP9B ATPIIB NEO1L HUSSY-20 | O43861 | 1 |
| Probable phospholipid-transporting ATPase VD (EC 3.6.3.1) (ATPase class V type 10D) | ATP10D ATPVD KIAA1487 | Q9P241 | 1 |
| Probable proline dehydrogenase 2 (EC 1.5.99.8) (Kidney and liver proline oxidase 1) (HsPOX1) (Probable proline oxidase 2) | PRODH2 | Q9UF12 | 1 |
| Probable serine carboxypeptidase CPVL (EC 3.4.16.-) (Carboxypeptidase, vitellogenic-like) (Vitellogenic carboxypeptidase-like protein) (VCP-like protein) (hVLP) | CPVL VLP PSEC0124 UNQ197/PRO223 | Q9H3G5 | 1 |
| Probable sodium-coupled neutral amino acid transporter 6 (N-system amino acid transporter 1) (NAT-1) (Na(+)-coupled neutral amino acid transporter 6) (Solute carrier family 38 member 6) | SLC38A6 NAT1 SNAT6 | Q8IZM9 | 1 |
| Probable threonine protease PRSS50 (EC 3.4.25.-) (Cancer/testis antigen 20) (Serine protease 50) (Testis-specific protease-like protein 50) | PRSS50 CT20 TSP50 | Q9UI38 | 1 |
| Probable tRNA pseudouridine synthase 2 (EC 5.4.99.-) | TRUB2 | O95900 | 1 |
| Probable tubulin polyglutamylase TTLL2 (EC 6.-.-.-) (Testis-specific protein NYD-TSPG) (Tubulin--tyrosine ligase-like protein 2) | TTLL2 C6orf104 | Q9BWV7 | 1 |
| Probable ubiquitin carboxyl-terminal hydrolase FAF-Y (EC 3.4.19.12) (Deubiquitinating enzyme FAF-Y) (Fat facets protein-related, Y-linked) (Ubiquitin thioesterase FAF-Y) (Ubiquitin-specific protease 9, Y chromosome) (Ubiquitin-specific-processing protease FAF-Y) | USP9Y DFFRY | O00507 | 1 |
| Probetacellulin [Cleaved into: Betacellulin (BTC)] | BTC | P35070 | 1 |
| Processing of 1, ribonuclease P/MRP subunit (S. cerevisiae) | POP1 | Q96F88 | 1 |
| Profilin-3 (Profilin III) | PFN3 | P60673 | 1 |
| Progesterone receptor (PR) (Nuclear receptor subfamily 3 group C member 3) | PGR NR3C3 | P06401 | 1 |
| Progesterone-induced-blocking factor 1 | PIBF1 C13orf24 PIBF | Q8WXW3 | 1 |
| Programmed cell death 1 ligand 1 (PD-L1) (PDCD1 ligand 1) (Programmed death ligand 1) (B7 homolog 1) (B7-H1) (CD antigen CD274) | CD274 B7H1 PDCD1L1 PDCD1LG1 PDL1 | Q9NZQ7 | 1 |
| Programmed cell death protein 2 | PDCD2 | E9PCU7 | 1 |
| Prokineticin receptor 2 (PK-R2) (G-protein coupled receptor 73-like 1) (GPR73b) (GPRg2) | PROKR2 GPR73L1 PKR2 | Q8NFJ6 | 1 |
| Prolactin (PRL) | PRL | P01236 | 1 |
| Prolactin receptor (PRL-R) | PRLR | P16471 | 1 |
| Prolactin regulatory element-binding protein (Mammalian guanine nucleotide exchange factor mSec12) | PREB SEC12 | Q9HCU5 | 1 |
| Prolactin-inducible protein (Gross cystic disease fluid protein 15) (GCDFP-15) (Prolactin-induced protein) (Secretory actin-binding protein) (SABP) (gp17) | PIP GCDFP15 GPIP4 | P12273 | 1 |
| Proline rich 11, isoform CRA_a (Transcription repressor of MHCII) | PRR11 hCG_1775215 | D2SNZ4 | 1 |
| Proline-rich membrane anchor 1 (PRiMA) | PRIMA1 | Q86XR5 | 1 |
| Proline-rich protein 1 (PRL1) (Basic proline-rich lacrimal protein) [Cleaved into: Opiorphin] | PROL1 BPLP | Q99935 | 1 |
| Proline-rich protein 20A | PRR20A PRR20 | P86496 | 1 |
| Proline-rich protein 25 | PRR25 gs64 | Q96S07 | 1 |
| Proline-rich protein 3 (MHC class I region proline-rich protein CAT56) | PRR3 CAT56 | P79522 | 1 |
| Proline-rich protein 4 (Lacrimal proline-rich protein) (Nasopharyngeal carcinoma-associated proline-rich protein 4) | PRR4 LPRP PROL4 | Q16378 | 1 |
| Prolow-density lipoprotein receptor-related protein 1 (LRP-1) (Alpha-2-macroglobulin receptor) (A2MR) (Apolipoprotein E receptor) (APOER) (CD antigen CD91) [Cleaved into: Low-density lipoprotein receptor-related protein 1 85 kDa subunit (LRP-85); Low-density lipoprotein receptor-related protein 1 515 kDa subunit (LRP-515); Low-density lipoprotein receptor-related protein 1 intracellular domain (LRPICD)] | LRP1 A2MR APR | Q07954 | 1 |
| Prominin-2 (PROM-2) (Prominin-like protein 2) (hPROML2) | PROM2 PROML2 UNQ2521/PRO6014 | Q8N271 | 1 |
| Proprotein convertase subtilisin/kexin type 5 (EC 3.4.21.-) (Proprotein convertase 5) (PC5) (Proprotein convertase 6) (PC6) (hPC6) (Subtilisin/kexin-like protease PC5) | PCSK5 PC5 PC6 | Q92824 | 1 |
| Prorelaxin H1 [Cleaved into: Relaxin B chain; Relaxin A chain] | RLN1 | P04808 | 1 |
| Prorelaxin H2 [Cleaved into: Relaxin B chain; Relaxin A chain] | RLN2 | P04090 | 1 |
| Prospero homeobox protein 1 (Homeobox prospero-like protein PROX1) (PROX-1) | PROX1 | Q92786 | 1 |
| Prostacyclin synthase (EC 5.3.99.4) (Prostaglandin I2 synthase) | PTGIS CYP8 CYP8A1 | Q16647 | 1 |
| Prostaglandin E synthase (EC 5.3.99.3) (Microsomal glutathione S-transferase 1-like 1) (MGST1-L1) (Microsomal prostaglandin E synthase 1) (MPGES-1) (p53-induced gene 12 protein) | PTGES MGST1L1 MPGES1 PGES PIG12 | O14684 | 1 |
| Prostaglandin E2 receptor EP4 subtype (PGE receptor EP4 subtype) (PGE2 receptor EP4 subtype) (Prostanoid EP4 receptor) | PTGER4 PTGER2 | P35408 | 1 |
| Prostaglandin F2 receptor negative regulator (CD9 partner 1) (CD9P-1) (Glu-Trp-Ile EWI motif-containing protein F) (EWI-F) (Prostaglandin F2-alpha receptor regulatory protein) (Prostaglandin F2-alpha receptor-associated protein) (CD antigen CD315) | PTGFRN CD9P1 EWIF FPRP KIAA1436 | Q9P2B2 | 1 |
| Prostaglandin F2-alpha receptor (PGF receptor) (PGF2-alpha receptor) (Prostanoid FP receptor) | PTGFR | P43088 | 1 |
| Prostaglandin G/H synthase 1 (EC 1.14.99.1) (Cyclooxygenase-1) (COX-1) (Prostaglandin H2 synthase 1) (PGH synthase 1) (PGHS-1) (PHS 1) (Prostaglandin-endoperoxide synthase 1) | PTGS1 COX1 | P23219 | 1 |
| Prostaglandin reductase 2 (PRG-2) (EC 1.3.1.48) (15-oxoprostaglandin 13-reductase) (Zinc-binding alcohol dehydrogenase domain-containing protein 1) | PTGR2 ZADH1 | Q8N8N7 | 1 |
| Proteasome assembly chaperone 3 (PAC-3) (hPAC3) | PSMG3 C7orf48 PAC3 | Q9BT73 | 1 |
| Proteasome assembly chaperone 4 (PAC-4) (hPAC4) | PSMG4 C6orf86 PAC4 | Q5JS54 | 1 |
| Proteasome subunit beta type (EC 3.4.25.1) | 0 | E9KL30 | 1 |
| Protein 4.1 variant (Fragment) | 0 | Q59F12 | 1 |
| Protein angel homolog 1 | ANGEL1 KIAA0759 | Q9UNK9 | 1 |
| Protein ANKUB1 (cDNA FLJ59820) | ANKUB1 | B4E2N8 | 1 |
| Protein arginine N-methyltransferase 7 (EC 2.1.1.-) (Histone-arginine N-methyltransferase PRMT7) (EC 2.1.1.125) ([Myelin basic protein]-arginine N-methyltransferase PRMT7) (EC 2.1.1.126) | PRMT7 KIAA1933 | Q9NVM4 | 1 |
| Protein argonaute-3 (Argonaute3) (hAgo3) (Argonaute RISC catalytic component 3) (Eukaryotic translation initiation factor 2C 3) (eIF-2C 3) (eIF2C 3) | AGO3 EIF2C3 | Q9H9G7 | 1 |
| Protein argonaute-4 (Argonaute4) (hAgo4) (Argonaute RISC catalytic component 4) (Eukaryotic translation initiation factor 2C 4) (eIF-2C 4) (eIF2C 4) | AGO4 EIF2C4 KIAA1567 | Q9HCK5 | 1 |
| Protein artemis (EC 3.1.-.-) (DNA cross-link repair 1C protein) (Protein A-SCID) (SNM1 homolog C) (hSNM1C) (SNM1-like protein) | DCLRE1C ARTEMIS ASCID SCIDA SNM1C | Q96SD1 | 1 |
| Protein atonal homolog 1 (Class A basic helix-loop-helix protein 14) (bHLHa14) (Helix-loop-helix protein hATH-1) (hATH1) | ATOH1 ATH1 BHLHA14 | Q92858 | 1 |
| Protein aurora borealis (HsBora) | BORA C13orf34 | Q6PGQ7 | 1 |
| Protein BEAN1 (Brain-expressed protein associating with Nedd4 homolog) (BEAN) | BEAN1 | Q3B7T3 | 1 |
| Protein BEX5 (Brain-expressed X-linked protein 5) (NGFRAP1-like protein 1) (Nerve growth factor receptor-associated protein 2) | BEX5 NADE2 NGFRAP1L1 | Q5H9J7 | 1 |
| Protein C9orf72 | C9orf72 | Q96LT7 | 1 |
| Protein CASC10 (Cancer susceptibility candidate gene 10 protein) | CASC10 C10orf114 | Q5T4H9 | 1 |
| Protein CIP2A (Cancerous inhibitor of PP2A) (p90 autoantigen) | KIAA1524 CIP2A | Q8TCG1 | 1 |
| Protein CLN8 | CLN8 C8orf61 | Q9UBY8 | 1 |
| Protein cornichon homolog 3 (CNIH-3) (Cornichon family AMPA receptor auxiliary protein 3) | CNIH3 | Q8TBE1 | 1 |
| Protein CROC-4 (Contingent replication of cDNA 4) | C1orf61 CROC4 | Q13536 | 1 |
| Protein crumbs homolog 1 | CRB1 | P82279 | 1 |
| Protein CYR61 (CCN family member 1) (Cysteine-rich angiogenic inducer 61) (Insulin-like growth factor-binding protein 10) (IBP-10) (IGF-binding protein 10) (IGFBP-10) (Protein GIG1) | CYR61 CCN1 GIG1 IGFBP10 | O00622 | 1 |
| Protein DDX26B | DDX26B | Q5JSJ4 | 1 |
| Protein DENND6A (DENN domain-containing protein 6A) | DENND6A FAM116A | Q8IWF6 | 1 |
| Protein diaphanous homolog 3 (Diaphanous-related formin-3) (DRF3) (MDia2) | DIAPH3 DIAP3 | Q9NSV4 | 1 |
| Protein dispatched homolog 1 | DISP1 DISPA | Q96F81 | 1 |
| Protein disulfide-isomerase A5 (EC 5.3.4.1) (Protein disulfide isomerase-related protein) | PDIA5 PDIR | Q14554 | 1 |
| Protein disulfide-isomerase-like protein of the testis | PDILT | Q8N807 | 1 |
| Protein eva-1 homolog C (Protein FAM176C) (SUE21) | EVA1C C21orf63 C21orf64 FAM176C PRED34 UNQ2504/PRO5993 | P58658 | 1 |
| Protein EVI2B (Ecotropic viral integration site 2B protein homolog) (EVI-2B) (CD antigen CD361) | EVI2B EVDB | P34910 | 1 |
| Protein eyes shut homolog (Epidermal growth factor-like protein 10) (EGF-like protein 10) (Epidermal growth factor-like protein 11) (EGF-like protein 11) (Protein spacemaker homolog) | EYS C6orf178 C6orf179 C6orf180 EGFL10 EGFL11 SPAM UNQ9424/PRO34591 | Q5T1H1 | 1 |
| Protein FAM102B | FAM102B | Q5T8I3 | 1 |
| Protein FAM122C | FAM122C | Q6P4D5 | 1 |
| Protein FAM124B | FAM124B | Q9H5Z6 | 1 |
| Protein FAM126B | FAM126B | Q8IXS8 | 1 |
| Protein FAM135B | FAM135B C8orfK32 | Q49AJ0 | 1 |
| Protein FAM160B2 (Retinoic acid-induced protein 16) | FAM160B2 RAI16 FP13191 | Q86V87 | 1 |
| Protein FAM163A (Cebelin) (Neuroblastoma-derived secretory protein) | FAM163A C1orf76 NDSP | Q96GL9 | 1 |
| Protein FAM168A (Tongue cancer chemotherapy resistance-associated protein 1) | FAM168A KIAA0280 TCRP1 | Q92567 | 1 |
| Protein FAM171B | FAM171B KIAA1946 NPD019 | Q6P995 | 1 |
| Protein FAM173B | FAM173B | Q6P4H8 | 1 |
| Protein FAM177B | FAM177B | A6PVY3 | 1 |
| Protein FAM185A | FAM185A | Q8N0U4 | 1 |
| Protein FAM193A (Protein IT14) | FAM193A C4orf8 RES4-22 | P78312 | 1 |
| Protein FAM198B (Expressed in nerve and epithelium during development) | FAM198B C4orf18 ENED AD021 UNQ2512/PRO6001 | Q6UWH4 | 1 |
| Protein FAM199X | FAM199X CXorf39 | Q6PEV8 | 1 |
| Protein FAM19A1 (Chemokine-like protein TAFA-1) | FAM19A1 TAFA1 | Q7Z5A9 | 1 |
| Protein FAM19A2 (Chemokine-like protein TAFA-2) | FAM19A2 TAFA2 | Q8N3H0 | 1 |
| Protein FAM203A (Brain protein 16) | FAM203A BRP16 C8orf30A | Q9BTY7 | 1 |
| Protein FAM209A | FAM209A C20orf106 | Q5JX71 | 1 |
| Protein FAM214A | FAM214A KIAA1370 | Q32MH5 | 1 |
| Protein FAM216A | FAM216A C12orf24 | Q8WUB2 | 1 |
| Protein FAM222B | FAM222B C17orf63 | Q8WU58 | 1 |
| Protein FAM24A | FAM24A | A6NFZ4 | 1 |
| Protein FAM24B | FAM24B | Q8N5W8 | 1 |
| Protein FAM49A | FAM49A | Q9H0Q0 | 1 |
| Protein FAM49B (L1) | FAM49B BM-009 | Q9NUQ9 | 1 |