| P protein (Melanocyte-specific transporter protein) (Pink-eyed dilution protein) | Oca2 P | Q62052 | 3 |
| Palladin | Palld Kiaa0992 | Q9ET54 | 3 |
| Pannexin-1 | Panx1 | Q9JIP4 | 3 |
| Parkinson disease 7 domain-containing protein 1 | Pddc1 | Q8BFQ8 | 3 |
| Paxillin | Pxn | F8VQ28 | 3 |
| PEAK1-related kinase-activating pseudokinase 1 | Prag1 D8Ertd82e | E9QLH9 | 3 |
| Peptidyl-prolyl cis-trans isomerase G (PPIase G) (Peptidyl-prolyl isomerase G) (EC 5.2.1.8) (Cyclophilin G) (Rotamase G) | Ppig | A2AR02 | 3 |
| Peptidyl-prolyl cis-trans isomerase NIMA-interacting 4 (EC 5.2.1.8) (Parvulin-14) (Par14) (Peptidyl-prolyl cis-trans isomerase Pin4) (PPIase Pin4) (Rotamase Pin4) | Pin4 | Q9CWW6 | 3 |
| Peptidylprolyl isomerase domain and WD repeat-containing protein 1 (EC 5.2.1.8) | Ppwd1 | Q8CEC6 | 3 |
| Peroxiredoxin-5, mitochondrial | Prdx5 | G3UZJ4 | 3 |
| Peroxisomal bifunctional enzyme (PBE) (PBFE) [Includes: Enoyl-CoA hydratase/3,2-trans-enoyl-CoA isomerase (EC 4.2.1.17) (EC 5.3.3.8); 3-hydroxyacyl-CoA dehydrogenase (EC 1.1.1.35)] | Ehhadh | Q9DBM2 | 3 |
| Peroxisome biogenesis factor 1 (Peroxin-1) | Pex1 | Q5BL07 | 3 |
| PH-interacting protein (PHIP) (IRS-1 PH domain-binding protein) (Neuronal differentiation-related protein) (NDRP) (WD repeat-containing protein 11) | Phip Ndrp Phip1 Wdr11 | Q8VDD9 | 3 |
| Phosphatidate cytidylyltransferase 2 (EC 2.7.7.41) (CDP-DAG synthase 2) (CDP-DG synthase 2) (CDP-diacylglycerol synthase 2) (CDS 2) (CDP-diglyceride pyrophosphorylase 2) (CDP-diglyceride synthase 2) (CTP:phosphatidate cytidylyltransferase 2) | Cds2 | Q99L43 | 3 |
| Phosphatidylinositol 3,4,5-trisphosphate 3-phosphatase and dual-specificity protein phosphatase PTEN (EC 3.1.3.16) (EC 3.1.3.48) (EC 3.1.3.67) (Mutated in multiple advanced cancers 1) (Phosphatase and tensin homolog) | Pten Mmac1 | O08586 | 3 |
| Phosphatidylinositol 3-kinase catalytic subunit type 3 (PI3-kinase type 3) (PI3K type 3) (PtdIns-3-kinase type 3) (EC 2.7.1.137) (Phosphoinositide-3-kinase class 3) | Pik3c3 Vps34 | Q6PF93 | 3 |
| Phosphatidylinositol transfer protein alpha isoform | Pitpna | J3QPW1 | 3 |
| Phosphofurin acidic cluster sorting protein 1 (PACS-1) | Pacs1 | Q8K212 | 3 |
| Phospholipase B-like 1 (EC 3.1.1.-) (LAMA-like protein 1) (Lamina ancestor homolog 1) (Phospholipase B domain-containing protein 1) [Cleaved into: Phospholipase B-like 1 chain A; Phospholipase B-like 1 chain B; Phospholipase B-like 1 chain C] | Plbd1 | Q8VCI0 | 3 |
| Phospholipase D4 (PLD 4) (EC 3.1.4.4) (Choline phosphatase 4) (Phosphatidylcholine-hydrolyzing phospholipase D4) | Pld4 | Q8BG07 | 3 |
| Phospholipid transfer protein C2CD2L (C2 domain-containing protein 2-like) (Transmembrane protein 24) | C2cd2l Tmem24 | Q80X80 | 3 |
| Phospholipid-transporting ATPase (EC 3.6.3.1) | Atp9b | D3YV00 | 3 |
| Phosphomannomutase 1 (PMM 1) (EC 5.4.2.8) | Pmm1 | O35621 | 3 |
| Phosphomevalonate kinase (PMKase) (EC 2.7.4.2) | Pmvk | Q9D1G2 | 3 |
| Phosphorylated adapter RNA export protein (RNA U small nuclear RNA export adapter protein) | Phax Rnuxa | Q9JJT9 | 3 |
| Pituitary tumor-transforming gene 1 protein-interacting protein (Fragment) | Pttg1ip | E0CXB5 | 3 |
| Platelet-derived growth factor receptor beta (PDGF-R-beta) (PDGFR-beta) (EC 2.7.10.1) (Beta platelet-derived growth factor receptor) (Beta-type platelet-derived growth factor receptor) | Pdgfrb | E9QPE2 | 3 |
| Pleckstrin homology domain-containing family A member 2 (PH domain-containing family A member 2) (PH domain-containing adaptor PHAD47) (Tandem PH domain-containing protein 2) (TAPP-2) | Plekha2 Tapp2 | Q9ERS5 | 3 |
| Pleckstrin homology domain-containing family A member 7 (PH domain-containing family A member 7) (Heart adapter protein 1) | Plekha7 Hadp1 | Q3UIL6 | 3 |
| Pleckstrin homology domain-containing family G member 3 (PH domain-containing family G member 3) | Plekhg3 Kiaa0599 | Q4VAC9 | 3 |
| Pleckstrin homology-like domain family A member 1 (Proline- and glutamine-rich protein) (PQ-rich protein) (PQR protein) (T-cell death-associated gene 51 protein) | Phlda1 Tdag51 | Q62392 | 3 |
| Pleckstrin homology-like domain, family B, member 3 | Phldb3 | E9QAF4 | 3 |
| Plexin-A4 | Plxna4 Kiaa1550 | Q80UG2 | 3 |
| Podocalyxin (Podocalyxin-like protein 1) (PC) (PCLP-1) | Podxl Pclp1 | Q9R0M4 | 3 |
| Podoplanin (Glycoprotein 38) (Gp38) (OTS-8) (PA2.26 antigen) (Transmembrane glycoprotein E11) (E11) | Pdpn Gp38 Ots8 | Q62011 | 3 |
| Poly [ADP-ribose] polymerase 1 (PARP-1) (EC 2.4.2.30) (ADP-ribosyltransferase diphtheria toxin-like 1) (ARTD1) (NAD(+) ADP-ribosyltransferase 1) (ADPRT 1) (Poly[ADP-ribose] synthase 1) (msPARP) | Parp1 Adprp Adprt Adprt1 | P11103 | 3 |
| Poly(A) polymerase alpha (PAP-alpha) (EC 2.7.7.19) (Polynucleotide adenylyltransferase) | Papola Pap Plap | Q61183 | 3 |
| Poly(ADP-ribose) glycohydrolase (EC 3.2.1.143) | Parg | O88622 | 3 |
| Poly(rC)-binding protein 4 | Pcbp4 | A0A0R4J044 | 3 |
| Polyadenylate-binding protein (PABP) | Pabpc4 | Q99LF8 | 3 |
| Polyadenylate-binding protein (PABP) | Pabpc2 mCG_13635 | Q62029 | 3 |
| Polyadenylate-binding protein-interacting protein 1 | Paip1 | D3Z3J6 | 3 |
| Pre-B-cell leukemia transcription factor-interacting protein 1 (Hematopoietic PBX-interacting protein) | Pbxip1 Hpip | Q3TVI8 | 3 |
| Pre-mRNA-processing factor 17 (Cell division cycle 40 homolog) (PRP17 homolog) | Cdc40 Prp17 Prpf17 | Q9DC48 | 3 |
| Pre-mRNA-splicing factor ISY1 homolog | Isy1 Kiaa1160 | Q69ZQ2 | 3 |
| Prefoldin 4 | Pfdn4 | Q6P0X1 | 3 |
| Prefoldin subunit 6 (Protein Ke2) | Pfdn6 H2-Ke2 Pfd6 | Q03958 | 3 |
| Prenylcysteine oxidase-like (EC 1.8.3.-) | Pcyox1l | Q8C7K6 | 3 |
| Presenilin (EC 3.4.23.-) | Psen2 | A0A0R4J1F2 | 3 |
| Probable ATP-dependent RNA helicase DDX52 (EC 3.6.4.13) (ATP-dependent RNA helicase ROK1-like) (DEAD box protein 52) | Ddx52 Rok1 | Q8K301 | 3 |
| Probable cytosolic iron-sulfur protein assembly protein CIAO1 (WD repeat-containing protein 39) | Ciao1 Wdr39 | Q99KN2 | 3 |
| Probable E3 ubiquitin-protein ligase DTX3 (EC 2.3.2.27) (Protein deltex-3) (Deltex3) (mDTX3) (RING-type E3 ubiquitin transferase DTX3) | Dtx3 | Q80V91 | 3 |
| Probable E3 ubiquitin-protein ligase makorin-2 (EC 2.3.2.27) (RING-type E3 ubiquitin transferase makorin-2) | Mkrn2 | Q9ERV1 | 3 |
| Probable phospholipid-transporting ATPase IH (EC 3.6.3.1) (ATPase IS) (ATPase class VI type 11A) (P4-ATPase flippase complex alpha subunit ATP11A) | Atp11a | P98197 | 3 |
| Probable phospholipid-transporting ATPase IIB (EC 3.6.3.1) (ATPase class II type 9B) | Atp9b | P98195 | 3 |
| Probable ribosome biogenesis protein RLP24 (Ribosomal L24 domain-containing protein 1) (Ribosomal protein L24-like) | Rsl24d1 | Q99L28 | 3 |
| Probable tRNA N6-adenosine threonylcarbamoyltransferase (EC 2.3.1.234) (N6-L-threonylcarbamoyladenine synthase) (t(6)A synthase) (O-sialoglycoprotein endopeptidase) (t(6)A37 threonylcarbamoyladenosine biosynthesis protein Osgep) (tRNA threonylcarbamoyladenosine biosynthesis protein Osgep) | Osgep | Q8BWU5 | 3 |
| Programmed cell death protein 4 (Protein MA-3) (Topoisomerase-inhibitor suppressed protein) | Pdcd4 Ma3 Tis | Q61823 | 3 |
| Prolactin-2C3 (Mitogen-regulated protein 2) (Mitogen-regulated protein 3) (Prolactin-2C4) (Proliferin-2) (Proliferin-3) | Prl2c3 Mrp2 Mrp3 Mrpplf3 Plf2 Plf3 Prl2c4 | P04768 | 3 |
| Proline-serine-threonine phosphatase-interacting protein 1 (PEST phosphatase-interacting protein 1) | Pstpip1 | P97814 | 3 |
| Prolyl 3-hydroxylase 1 (EC 1.14.11.7) (Growth suppressor 1) (Leucine- and proline-enriched proteoglycan 1) (Leprecan-1) | P3h1 Gros1 Lepre1 | Q3V1T4 | 3 |
| Prolyl 3-hydroxylase 2 (EC 1.14.11.7) (Leprecan-like protein 1) | P3h2 Leprel1 | Q8CG71 | 3 |
| Prolyl 4-hydroxylase subunit alpha-2 (4-PH alpha-2) (EC 1.14.11.2) (Procollagen-proline,2-oxoglutarate-4-dioxygenase subunit alpha-2) | P4ha2 | Q60716 | 3 |
| 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 Cox-1 Cox1 | P22437 | 3 |
| Prostasin (EC 3.4.21.-) (Channel-activating protease 1) (CAP1) (Serine protease 8) [Cleaved into: Prostasin light chain; Prostasin heavy chain] | Prss8 Cap1 | Q9ESD1 | 3 |
| Prostasin (Protease, serine, 8 (Prostasin)) | Prss8 | Q99L44 | 3 |
| Protein arginine N-methyltransferase 8 (EC 2.1.1.-) (Heterogeneous nuclear ribonucleoprotein methyltransferase-like protein 4) | Prmt8 Hrmt1l4 | Q6PAK3 | 3 |
| Protein CASC3 (Cancer susceptibility candidate gene 3 protein homolog) (Metastatic lymph node gene 51 protein homolog) (MLN 51 homolog) (Protein barentsz) (Btz) (mBtz) | Casc3 Mln51 | Q8K3W3 | 3 |
| Protein CDV3 (Carnitine deficiency-associated protein 3) (Tyrosine-phosphorylated protein 36) (TPP36) | Cdv3 | Q4VAA2 | 3 |
| Protein diaphanous homolog 2 (Diaphanous-related formin-2) (DRF2) (mDia3) | Diaph2 Diap2 | O70566 | 3 |
| Protein diaphanous homolog 3 | Diaph3 | F8WIG5 | 3 |
| Protein disulfide-isomerase A6 (Putative uncharacterized protein) | Pdia6 | Q3TML0 | 3 |
| Protein FAM111A | Fam111a Kiaa1895 | Q9D2L9 | 3 |
| Protein FAM126B | Fam126b D1Ertd53e | Q8C729 | 3 |
| Protein FAM134C | Fam134c | Q9CQV4 | 3 |
| Protein FAM198B (Expressed in nerve and epithelium during development) | Fam198b Ened | Q3UPI1 | 3 |
| Protein FAM3C (Interleukin-like EMT inducer) | Fam3c D6Wsu176e Ilei | Q91VU0 | 3 |
| Protein GPR107 | Gpr107 Kiaa1624 | Q8BUV8 | 3 |
| Protein HEG homolog 1 | Heg1 | E9Q7X6 | 3 |
| Protein Hook homolog 3 (mHK3) | Hook3 | Q8BUK6 | 3 |
| Protein inscuteable homolog (RIKEN cDNA 3830422K02, isoform CRA_c) | Insc 3830422K02Rik mCG_7306 | G3UW77 | 3 |
| Protein KHNYN (KH and NYN domain-containing protein) | Khnyn Kiaa0323 | Q80U38 | 3 |
| Protein kinase C epsilon type (EC 2.7.11.13) (nPKC-epsilon) | Prkce Pkce Pkcea | P16054 | 3 |
| Protein kinase C iota type (EC 2.7.11.13) (Atypical protein kinase C-lambda/iota) (aPKC-lambda/iota) (nPKC-iota) | Prkci Pkcl | Q62074 | 3 |
| Protein kinase C theta type (EC 2.7.11.13) (nPKC-theta) | Prkcq Pkcq | Q02111 | 3 |
| Protein kish-A (Transmembrane protein 167) (Transmembrane protein 167A) | Tmem167a Tmem167 | Q9CR64 | 3 |
| Protein KTI12 homolog | Kti12 | Q9D1R2 | 3 |
| Protein lifeguard 3 (Fragment) | Tmbim1 | D3Z0A5 | 3 |
| Protein lifeguard 3 (Putative uncharacterized protein) (Transmembrane BAX inhibitor motif containing 1, isoform CRA_b) | Tmbim1 mCG_114808 | Q3U717 | 3 |
| Protein mago nashi homolog 2 | Magohb Magoh-rs1 Magoh2 | Q9CQL1 | 3 |
| Protein misato homolog 1 | Msto1 | E9PUB7 | 3 |
| Protein NipSnap homolog 1 (NipSnap1) | Nipsnap1 | O55125 | 3 |
| Protein NipSnap homolog 3B (NipSnap3B) (NipSnap-related protein) (Protein NipSnap homolog 3A) (NipSnap3A) | Nipsnap3b Nipsnap3a | Q9CQE1 | 3 |
| Protein O-glucosyltransferase 1 (EC 2.4.1.-) (CAP10-like 46 kDa protein) (KTEL motif-containing protein 1) (O-glucosyltransferase Rumi homolog) (Rumi) (Protein O-xylosyltransferase POGLUT1) (EC 2.4.2.26) (Wing-shaped neural plate protein) (Wsnp) | Poglut1 Clp46 Ktelc1 | Q8BYB9 | 3 |
| Protein phosphatase 1 regulatory subunit 14B (Phosphatase holoenzyme inhibitor 1) (PHI-1) (Phospholipase C-beta-3 neighbouring gene protein) | Ppp1r14b Png | Q62084 | 3 |
| Protein phosphatase 1, regulatory (inhibitor) subunit 9A | Ppp1r9a | H3BKQ7 | 3 |
| Protein phosphatase 1F (EC 3.1.3.16) (Ca(2+)/calmodulin-dependent protein kinase phosphatase) (CaM-kinase phosphatase) (CaMKPase) | Ppm1f | Q8CGA0 | 3 |
| Protein PRRC2A (HLA-B-associated transcript 2) (Proline-rich and coiled-coil-containing protein 2A) | Prrc2a Bat2 | Q7TSC1 | 3 |
| Protein regulator of cytokinesis 1 | Prc1 | G3UWQ7 | 3 |
| Protein RMD5 homolog A | Rmnd5a | Q80YQ8 | 3 |