| Probable phospholipid-transporting ATPase IC (EC 3.6.3.1) (ATPase class I type 8B member 1) | Atp8b1 | Q148W0 | 1 |
| Probable phospholipid-transporting ATPase ID | Atp8b2 | E9QAL4 | 1 |
| Probable phospholipid-transporting ATPase IH (EC 3.6.3.1) (ATPase IS) (ATPase class VI type 11A) | Atp11a | P98197 | 1 |
| Probable proline--tRNA ligase, mitochondrial (EC 6.1.1.15) (Prolyl-tRNA synthetase) (ProRS) | Pars2 | Q8CFI5 | 1 |
| Probable ribosome biogenesis protein RLP24 (Ribosomal L24 domain-containing protein 1) (Ribosomal protein L24-like) | Rsl24d1 | Q99L28 | 1 |
| Probable RNA polymerase II nuclear localization protein SLC7A6OS (Solute carrier family 7 member 6 opposite strand transcript homolog) | Slc7a6os | Q7TPE5 | 1 |
| Probable rRNA-processing protein EBP2 | Ebna1bp2 Ebp2 | Q9D903 | 1 |
| Probable threonine--tRNA ligase 2, cytoplasmic (EC 6.1.1.3) (Threonyl-tRNA synthetase) (ThrRS) (Threonyl-tRNA synthetase-like protein 2) | Tarsl2 | Q8BLY2 | 1 |
| Probable tRNA N6-adenosine threonylcarbamoyltransferase, mitochondrial (EC 2.3.1.-) (O-sialoglycoprotein endopeptidase-like protein 1) (t(6)A37 threonylcarbamoyladenosine biosynthesis protein Osgepl1) (tRNA threonylcarbamoyladenosine biosynthesis protein Osgepl1) | Osgepl1 | Q6PEB4 | 1 |
| Probable tRNA pseudouridine synthase 1 (EC 5.4.99.-) | Trub1 | Q8C0D0 | 1 |
| Probable tubulin polyglutamylase TTLL1 (EC 6.-.-.-) (Tubulin polyglutamylase complex subunit 3) (PGs3) (Tubulin--tyrosine ligase-like protein 1) (p49) | Ttll1 | Q91V51 | 1 |
| Probable Xaa-Pro aminopeptidase 3 (X-Pro aminopeptidase 3) (EC 3.4.11.9) (Aminopeptidase P3) (APP3) | Xpnpep3 | B7ZMP1 | 1 |
| Probasin (PB) | Pbsn Prbs | O08976 | 1 |
| Probetacellulin [Cleaved into: Betacellulin (BTC)] | Btc Bcn | Q05928 | 1 |
| Procollagen C-endopeptidase enhancer 1 (P14) (Procollagen COOH-terminal proteinase enhancer 1) (PCPE-1) (Procollagen C-proteinase enhancer 1) (Type 1 procollagen C-proteinase enhancer protein) (Type I procollagen COOH-terminal proteinase enhancer) | Pcolce Pcpe1 | Q61398 | 1 |
| Procollagen C-endopeptidase enhancer 2 (Procollagen COOH-terminal proteinase enhancer 2) (PCPE-2) (Procollagen C-proteinase enhancer 2) | Pcolce2 Pcpe2 | Q8R4W6 | 1 |
| Procollagen galactosyltransferase 1 (EC 2.4.1.50) (Collagen beta(1-O)galactosyltransferase 1) (Glycosyltransferase 25 family member 1) (Hydroxylysine galactosyltransferase 1) | Colgalt1 Glt25d1 | Q8K297 | 1 |
| Procollagen-lysine,2-oxoglutarate 5-dioxygenase 3 (EC 1.14.11.4) (Lysyl hydroxylase 3) (LH3) | Plod3 | Q9R0E1 | 1 |
| Progestin and adipoQ receptor family member 3 (Progestin and adipoQ receptor family member III) (Raf kinase trapping to Golgi) (RKTG) | Paqr3 | Q6TCG8 | 1 |
| Progestin and adipoQ receptor family member 4 (Progestin and adipoQ receptor family member IV) | Paqr4 MNCb-0914 | Q9JJE4 | 1 |
| Progestin and adipoQ receptor family member 9 (Progestin and adipoQ receptor family member IX) | Paqr9 | Q6TCG2 | 1 |
| Programmed cell death protein 2 (Zinc finger protein Rp-8) | Pdcd2 Rp8 | P46718 | 1 |
| Programmed cell death protein 2-like | Pdcd2l | Q8C5N5 | 1 |
| Programmed cell death protein 5 (TF-1 cell apoptosis-related protein 19) (Protein TFAR19) | Pdcd5 Tfar19 | P56812 | 1 |
| Prokineticin-1 (Endocrine-gland-derived vascular endothelial growth factor) (EG-VEGF) | Prok1 Pk1 | Q14A28 | 1 |
| Prolactin, isoform CRA_b | Prl mCG_15525 | Q3TT66 | 1 |
| Prolactin-2B1 (Placental prolactin-like protein K) (PLP-K) (PRL-like protein K) | Prl2b1 Prlpk | Q9DAZ2 | 1 |
| Prolactin-2C3 (Mitogen-regulated protein 2) (Mitogen-regulated protein 3) (Prolactin-2C4) (Proliferin-2) (Proliferin-3) | Prl2c3 Mrp2 Mrp3 Mrpplf3 Plf2 Plf3 Prl2c4 | P04768 | 1 |
| Proline dehydrogenase 1, mitochondrial (EC 1.5.99.8) (Proline oxidase) | Prodh Pro1 | Q9WU79 | 1 |
| Proline rich 19 (Protein Prr19) | Prr19 | B2RW88 | 1 |
| Proline-, glutamic acid- and leucine-rich protein 1 (Modulator of non-genomic activity of estrogen receptor) | Pelp1 Mnar | Q9DBD5 | 1 |
| Proline-rich acidic protein 1 (Pregnancy-specific uterine protein) (Uterine-specific proline-rich acidic protein) | Prap1 Upa | Q80XD8 | 1 |
| Proline-rich protein 11 | Prr11 | Q8BHE0 | 1 |
| Proline-rich protein 18 | Prr18 | Q6PAN7 | 1 |
| Prolyl 3-hydroxylase 1 (EC 1.14.11.7) (Growth suppressor 1) (Leucine- and proline-enriched proteoglycan 1) (Leprecan-1) | Lepre1 Gros1 P3h1 | Q3V1T4 | 1 |
| 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 | 1 |
| Prospero homeobox protein 1 (Homeobox prospero-like protein PROX1) (PROX-1) | Prox1 | P48437 | 1 |
| Prostacyclin receptor (Prostaglandin I2 receptor) (PGI receptor) (PGI2 receptor) (Prostanoid IP receptor) | Ptgir | P43252 | 1 |
| Prostaglandin D2 receptor (PGD receptor) (PGD2 receptor) (Prostanoid DP receptor) | Ptgdr | P70263 | 1 |
| Prostaglandin E receptor 3 (Subtype EP3) (Prostaglandin E receptor 3 (Subtype EP3), isoform CRA_c) (Prostaglandin E2 receptor EP3 subtype) | Ptger3 mCG_2590 | Q6PDF2 | 1 |
| Prostaglandin F2-alpha receptor (PGF receptor) (PGF2-alpha receptor) (Prostanoid FP receptor) | Ptgfr | P43117 | 1 |
| Prostamide/prostaglandin F synthase (Prostamide/PG F synthase) (Prostamide/PGF synthase) (EC 1.11.1.20) | Fam213b | Q9DB60 | 1 |
| Prostasin (Protease, serine, 8 (Prostasin)) | Prss8 | Q99L44 | 1 |
| Proteasome activator complex subunit 2 (11S regulator complex subunit beta) (REG-beta) (Activator of multicatalytic protease subunit 2) (Proteasome activator 28 subunit beta) (PA28b) (PA28beta) | Psme2 Pa28b1 | P97372 | 1 |
| Proteasome activator complex subunit 3 (11S regulator complex subunit gamma) (REG-gamma) (Activator of multicatalytic protease subunit 3) (Ki nuclear autoantigen) (Proteasome activator 28 subunit gamma) (PA28g) (PA28gamma) | Psme3 | P61290 | 1 |
| Proteasome subunit beta type-1 (EC 3.4.25.1) (Macropain subunit C5) (Multicatalytic endopeptidase complex subunit C5) (Proteasome component C5) (Proteasome gamma chain) | Psmb1 | O09061 | 1 |
| Proteasome subunit beta type-5 (EC 3.4.25.1) (Macropain epsilon chain) (Multicatalytic endopeptidase complex epsilon chain) (Proteasome chain 6) (Proteasome epsilon chain) (Proteasome subunit X) | Psmb5 | O55234 | 1 |
| Proteasome subunit beta type-9 (EC 3.4.25.1) (LMP-2d) (Low molecular mass protein 2) (Macropain chain 7) (Multicatalytic endopeptidase complex chain 7) (Proteasome chain 7) (Proteasome subunit beta-1i) (Really interesting new gene 12 protein) | Psmb9 Lmp2 Ring12 | P28076 | 1 |
| Protection of telomeres protein 1 (mPot1) (POT1-like telomere end-binding protein) | Pot1 Pot1a | Q91WC1 | 1 |
| Protein 1100001G20Rik (RIKEN cDNA 1100001G20) | 1100001G20Rik mCG_1032064 | Q8BTE6 | 1 |
| Protein 1700001O22Rik (RIKEN cDNA 1700001O22, isoform CRA_a) | 1700001O22Rik mCG_18997 | A2APZ1 | 1 |
| Protein 1700008I05Rik (Uncharacterized protein) | 1700008I05Rik | A2AEI7 | 1 |
| Protein 1700010B08Rik | 1700010B08Rik | Q9DAI7 | 1 |
| Protein 2010002M12Rik (Uncharacterized protein) | 2010002M12Rik | Q3U687 | 1 |
| Protein 2010106E10Rik (RIKEN cDNA 2010106E10, isoform CRA_b) | 2010106E10Rik mCG_8605 | A2ANY3 | 1 |
| Protein 2310002L09Rik (Uncharacterized protein) | 2310002L09Rik mCG_6158 | Q14C20 | 1 |
| Protein 2310014L17Rik (RIKEN cDNA 2310014L17) (Uncharacterized protein) | 2310014L17Rik mCG_22550 | Q9D7D1 | 1 |
| Protein 2310061I04Rik | 2310061I04Rik | B8JJ69 | 1 |
| Protein 2410002F23Rik (RIKEN cDNA 2410002F23, isoform CRA_a) | 2410002F23Rik mCG_134547 | Q3TE80 | 1 |
| Protein 2700089E24Rik | 2700089E24Rik | E9Q3K4 | 1 |
| Protein 2810007J24Rik (RIKEN cDNA 2810007J24, isoform CRA_a) (Sulfotransferase-like protein 1) | 2810007J24Rik mCG_6335 | Q8BGL3 | 1 |
| Protein 4.1 (P4.1) (4.1R) (Band 4.1) | Epb41 Epb4.1 Kiaa4056 | P48193 | 1 |
| Protein 4930523C07Rik | 4930523C07Rik | E9Q2T4 | 1 |
| Protein 4930549C01Rik (Uncharacterized protein) | 4930549C01Rik | Q9CPU3 | 1 |
| Protein 4931406P16Rik | 4931406P16Rik | Q8C5X1 | 1 |
| Protein 4932418E24Rik | 4932418E24Rik | Q8C5V8 | 1 |
| Protein 4933426M11Rik (RIKEN cDNA 4933426M11, isoform CRA_b) (Uncharacterized protein) | 4933426M11Rik mCG_116315 | Q8BGE4 | 1 |
| Protein 5031410I06Rik | 5031410I06Rik | E9Q4E0 | 1 |
| Protein 5730507C01Rik | 5730507C01Rik | J3QPX0 | 1 |
| Protein 9430015G10Rik | 9430015G10Rik | A2ASP7 | 1 |
| Protein A430078G23Rik | A430078G23Rik | E9Q7Y4 | 1 |
| Protein A530032D15Rik | A530032D15Rik | E9PV05 | 1 |
| Protein Abca14 | Abca14 | E9Q8F8 | 1 |
| Protein ACN9 homolog, mitochondrial | Acn9 | Q8BQU3 | 1 |
| Protein Adamts17 | Adamts17 | E9Q4D1 | 1 |
| Protein Adamts9 | Adamts9 | E9PYV8 | 1 |
| Protein AF1q | Mllt11 Af1q | P97783 | 1 |
| Protein AI182371 | AI182371 | A2AS37 | 1 |
| Protein AMBP [Cleaved into: Alpha-1-microglobulin; Inter-alpha-trypsin inhibitor light chain (ITI-LC) (Bikunin) (HI-30); Trypstatin] | Ambp Itil | Q07456 | 1 |
| Protein Ankrd29 | Ankrd29 | D3YVV3 | 1 |
| Protein Apol11b | Apol11b | E9PUZ0 | 1 |
| Protein arginine N-methyltransferase 1 (EC 2.1.1.-) (Histone-arginine N-methyltransferase PRMT1) (EC 2.1.1.125) | Prmt1 Hrmt1l2 Mrmt1 | Q9JIF0 | 1 |
| Protein arginine N-methyltransferase 3 (EC 2.1.1.-) (Heterogeneous nuclear ribonucleoprotein methyltransferase-like protein 3) | Prmt3 Hrmt1l3 | Q922H1 | 1 |
| Protein argonaute-3 (Argonaute3) (mAgo3) (Argonaute RISC catalytic component 3) (Eukaryotic translation initiation factor 2C 3) (eIF-2C 3) (eIF2C 3) (Piwi/argonaute family protein meIF2C3) | Ago3 Eif2c3 | Q8CJF9 | 1 |
| Protein argonaute-4 (Argonaute4) (mAgo4) (Argonaute RISC catalytic component 4) (Eukaryotic translation initiation factor 2C 4) (eIF-2C 4) (eIF2C 4) (Piwi/argonaute family protein meIF2C4) | Ago4 Eif2c4 Kiaa1567 | Q8CJF8 | 1 |
| Protein Arid4a | Arid4a | F8VPQ2 | 1 |
| Protein Atad2b | Atad2b | E9Q166 | 1 |
| Protein AU019823 | AU019823 | E9PUQ3 | 1 |
| Protein BC049730 (cDNA sequence BC049730) | BC049730 mCG_1050139 | Q810N3 | 1 |
| Protein BC051665 | BC051665 | E9Q623 | 1 |
| Protein BC147527 (Similar to 2-cell-stage, variable group, member 3) | BC147527 Gm8953 LOC625360 | Q3V185 | 1 |
| Protein broad-minded (TBC1 domain family member 32) | Tbc1d32 Bromi | Q3URV1 | 1 |
| Protein Btaf1 | Btaf1 | E9QAE3 | 1 |
| Protein BTG3 (Abundant in neuroepithelium area protein) (BTG family member 3) (Protein Tob5) | Btg3 Ana Tob5 | P50615 | 1 |
| Protein C-ets-2 | Ets2 | P15037 | 1 |
| Protein C10 | Grcc10 C10 | O35127 | 1 |
| Protein C19orf12 homolog | 0 | Q8WUR0 | 1 |
| Protein canopy homolog 1 | Cnpy1 | Q4VAB4 | 1 |
| Protein capicua homolog | Cic Kiaa0306 | Q924A2 | 1 |
| Protein CBFA2T3 (Eight twenty one protein 2) (MTG8-related protein 2) (Protein ETO-2) | Cbfa2t3 Cbfa2t3h Mtgr2 | O54972 | 1 |