| Ras-related protein Ral-A | Rala Ral Ral-a | P63321 | 1 |
| Ras-related protein Rap-1b (GTP-binding protein smg p21B) | Rap1b | Q99JI6 | 1 |
| Ras-related protein Rap-2a | Rap2a | Q80ZJ1 | 1 |
| Ras-related protein Rap-2c | Rap2c | Q8BU31 | 1 |
| Ras-specific guanine nucleotide-releasing factor RalGPS2 (Ral GEF with PH domain and SH3-binding motif 2) (RalA exchange factor RalGPS2) | Ralgps2 | Q9ERD6 | 1 |
| RBPJ-interacting and tubulin-associated protein | Rita | Q9D1H0 | 1 |
| RCC1 domain-containing protein 1 | Rccd1 | Q8BTU7 | 1 |
| Receptor-interacting serine/threonine-protein kinase 1 (EC 2.7.11.1) (Cell death protein RIP) (Receptor-interacting protein 1) (RIP-1) (Serine/threonine-protein kinase RIP) | Ripk1 Rinp Rip | Q60855 | 1 |
| Receptor-transporting protein 3 (Transmembrane protein 7) | Rtp3 Tmem7 | Q5QGU6 | 1 |
| Receptor-transporting protein 4 (28 kDa interferon-responsive protein) | Rtp4 Ifrg28 | Q9ER80 | 1 |
| Receptor-type tyrosine-protein phosphatase delta (Protein-tyrosine phosphatase delta) (R-PTP-delta) (EC 3.1.3.48) | Ptprd | Q64487 | 1 |
| Receptor-type tyrosine-protein phosphatase mu (Protein-tyrosine phosphatase mu) (R-PTP-mu) (EC 3.1.3.48) | Ptprm Kiaa4044 | P28828 | 1 |
| Regenerating islet-derived protein 3-alpha (REG-3-alpha) (Islet of Langerhans regenerating protein 3) (Lithostathine 3) (Pancreatitis-associated protein 2) (Regenerating islet-derived protein III-alpha) (Reg III-alpha) [Cleaved into: Regenerating islet-derived protein 3-alpha 16.5 kDa form; Regenerating islet-derived protein 3-alpha 15 kDa form] | Reg3a Pap2 | O09037 | 1 |
| Regenerating islet-derived protein 3-beta (REG-3-beta) (Pancreatitis-associated protein 1) (Regenerating islet-derived protein III-beta) (Reg III-beta) [Cleaved into: Regenerating islet-derived protein 3-beta 16.5 kDa form; Regenerating islet-derived protein 3-beta 15 kDa form] | Reg3b Pap Pap1 | P35230 | 1 |
| Regulator of G-protein signaling 19 (RGS19) | Rgs19 | Q9CX84 | 1 |
| Regulator of G-protein signaling 9 (RGS9) | Rgs9 | O54828 | 1 |
| Regulatory-associated protein of mTOR | Rptor 4932417H02Rik mCG_15044 | A2ACM0 | 1 |
| REM2- and Rab-like small GTPase 1 | Rsg1 Gm723 | A2A825 | 1 |
| Replication factor C subunit 5 (Activator 1 36 kDa subunit) (A1 36 kDa subunit) (Activator 1 subunit 5) (Replication factor C 36 kDa subunit) (RF-C 36 kDa subunit) (RFC36) | Rfc5 | Q9D0F6 | 1 |
| Repressor of RNA polymerase III transcription MAF1 homolog | Maf1 | Q9D0U6 | 1 |
| Reprimo-like protein | Rprml | Q3URD2 | 1 |
| Retbindin | Rtbdn | Q8QZY4 | 1 |
| Reticulocalbin-1 | Rcn1 Rca1 Rcn | Q05186 | 1 |
| Reticulon-4-interacting protein 1, mitochondrial (NOGO-interacting mitochondrial protein) | Rtn4ip1 Nimp | Q924D0 | 1 |
| Retinal-specific ATP-binding cassette transporter (ATP-binding cassette sub-family A member 4) (RIM ABC transporter) (RIM protein) (RmP) | Abca4 Abcr | O35600 | 1 |
| Retinoblastoma-like protein 1 (107 kDa retinoblastoma-associated protein) (p107) (pRb1) | Rbl1 | Q64701 | 1 |
| Retinoic acid receptor RXR-gamma (Nuclear receptor subfamily 2 group B member 3) (Retinoid X receptor gamma) | Rxrg Nr2b3 | P28705 | 1 |
| Retrograde Golgi transport protein RGP1 homolog | Rgp1 Kiaa0258 | Q8BHT7 | 1 |
| Rho GDP-dissociation inhibitor 1 (Rho GDI 1) (GDI-1) (Rho-GDI alpha) | Arhgdia C87222 Gdi1 | Q99PT1 | 1 |
| Rho GTPase-activating protein 15 (ArhGAP15) (Rho-type GTPase-activating protein 15) | Arhgap15 | Q811M1 | 1 |
| Rho GTPase-activating protein 21 (Rho GTPase-activating protein 10) (Rho-type GTPase-activating protein 21) | Arhgap21 Arhgap10 Kiaa1424 | Q6DFV3 | 1 |
| Rho GTPase-activating protein 23 (Rho-type GTPase-activating protein 23) | Arhgap23 Kiaa1501 MNCb-1301 | Q69ZH9 | 1 |
| Rho GTPase-activating protein 24 (Rho-type GTPase-activating protein 24) | Arhgap24 | Q8C4V1 | 1 |
| Rho GTPase-activating protein 31 (Cdc42 GTPase-activating protein) | Arhgap31 Cdgap Kiaa1204 | A6X8Z5 | 1 |
| Rho GTPase-activating protein 35 (Glucocorticoid receptor DNA-binding factor 1) | Arhgap35 Grlf1,Kiaa1722 | Q91YM2 | 1 |
| Rho GTPase-activating protein 39 | Arhgap39 D15Wsu169e Kiaa1688 | P59281 | 1 |
| Rho guanine nucleotide exchange factor 10-like protein (GrinchGEF) | Arhgef10l Kiaa1626 | A2AWP8 | 1 |
| Rho guanine nucleotide exchange factor 15 (Ephexin-5) (E5) | Arhgef15 Kiaa0915 | Q5FWH6 | 1 |
| Rho guanine nucleotide exchange factor 17 | Arhgef17 Kiaa0337 | Q80U35 | 1 |
| Rho guanine nucleotide exchange factor 18 | Arhgef18 Kiaa0521 | Q6P9R4 | 1 |
| Rho guanine nucleotide exchange factor 25 (Guanine nucleotide exchange factor GEFT) (Rac/Cdc42/Rho exchange factor GEFT) (RhoA/Rac/Cdc42 guanine nucleotide exchange factor GEFT) (p63RhoGEF) | Arhgef25 D10Ertd610e Geft | Q9CWR0 | 1 |
| Rho-related GTP-binding protein Rho6 (Rho family GTPase 1) (Rnd1) | Rnd1 Rho6 | Q8BLR7 | 1 |
| Rho-related GTP-binding protein RhoB | Rhob Arhb | P62746 | 1 |
| Rho-related GTP-binding protein RhoC (Silica-induced gene 61 protein) (SIG-61) | Rhoc Arhc | Q62159 | 1 |
| Rho-related GTP-binding protein RhoE (Rho family GTPase 3) (Rnd3) | Rnd3 Arhe Rhoe | P61588 | 1 |
| Rho-related GTP-binding protein RhoU (Rho GTPase-like protein ARHU) (Wnt-1 responsive Cdc42 homolog 1) (WRCH-1) | Rhou Arhu G28k Wrch1 | Q9EQT3 | 1 |
| Rhomboid domain-containing protein 3 | Rhbdd3 | Q8BP97 | 1 |
| Ribonuclease inhibitor (Ribonuclease/angiogenin inhibitor 1) | Rnh1 Rnh | Q91VI7 | 1 |
| Ribonuclease P protein subunit p20 (RNaseP protein p20) (EC 3.1.26.5) | Pop7 Rpp20 | Q9DCH2 | 1 |
| Ribonuclease P protein subunit p38 (Ribonuclease P/MRP 38 subunit (Human)) | Rpp38 mCG_17284 | A2AJG0 | 1 |
| Ribonuclease P/MRP protein subunit POP5 (EC 3.1.26.5) | Pop5 | Q9DB28 | 1 |
| Ribonuclease ZC3H12A (EC 3.1.-.-) (MCP-induced protein 1) (Zinc finger CCCH domain-containing protein 12A) | Zc3h12a Mcpip Mcpip1 | Q5D1E7 | 1 |
| Ribosomal protein S6 kinase (EC 2.7.11.1) | Rps6ka1 | Q505N6 | 1 |
| Ribosomal protein S6 kinase delta-1 (S6K-delta-1) (EC 2.7.11.1) (52 kDa ribosomal protein S6 kinase) | Rps6kc1 | Q8BLK9 | 1 |
| Ribosomal RNA processing protein 1 homolog B (RRP1-like protein B) | Rrp1b | Q91YK2 | 1 |
| Ribosomal RNA small subunit methyltransferase NEP1 (EC 2.1.1.-) (18S rRNA (pseudouridine-N1-)-methyltransferase NEP1) (Nucleolar protein EMG1 homolog) (Protein C2f) (Ribosome biogenesis protein NEP1) | Emg1 C2f Grcc2f | O35130 | 1 |
| Ribosomal RNA-processing protein 7 homolog A (Gastric cancer antigen Zg14 homolog) | Rrp7a | Q9D1C9 | 1 |
| Ribosome maturation protein SBDS (Protein 22A3) (Shwachman-Bodian-Diamond syndrome protein homolog) | Sbds | P70122 | 1 |
| RIKEN cDNA 1700045I19 | Rnf138rt1 1700045I19Rik mCG_115698 | Q9D9M9 | 1 |
| RING finger and transmembrane domain-containing protein 1 | Rnft1 | Q9DCN7 | 1 |
| RING finger protein 145 | Rnf145 | Q5SWK7 | 1 |
| RING finger protein 157 | Rnf157 | A2AAN9 | 1 |
| RING finger protein 166 | Rnf166 | Q3U9F6 | 1 |
| RING finger protein 17 (Mad member-interacting protein 2) (Mmip-2) | Rnf17 | Q99MV7 | 1 |
| RING finger protein 24 | Rnf24 | Q8BGI1 | 1 |
| RING finger protein 37 (U-box domain-containing protein 5) (UbcM4-interacting protein 5) (Ubiquitin-conjugating enzyme 7-interacting protein 5) | Ubox5 Rnf37 Ubce7ip5 Uip5 | Q925F4 | 1 |
| RNA 3'-terminal phosphate cyclase (RNA cyclase) (RNA-3'-phosphate cyclase) (EC 6.5.1.4) (RNA terminal phosphate cyclase domain-containing protein 1) | RtcA Rpc1 Rtcd1 | Q9D7H3 | 1 |
| RNA polymerase I-specific transcription initiation factor RRN3 | Rrn3 | B2RS91 | 1 |
| RNA polymerase II-associated protein 3 | Rpap3 D15Ertd682e | Q9D706 | 1 |
| RNA-binding protein 12 (RNA-binding motif protein 12) (SH3/WW domain anchor protein in the nucleus) (SWAN) | Rbm12 | Q8R4X3 | 1 |
| RNA-binding protein 20 (RNA-binding motif protein 20) | Rbm20 | Q3UQS8 | 1 |
| RNA-binding protein 26 (Protein expressed in male leptotene and zygotene spermatocytes 393) (MLZ-393) (RNA-binding motif protein 26) | Rbm26 | Q6NZN0 | 1 |
| RNA-binding protein 27 (Peri-implantation stem cell protein 1) (RNA-binding motif protein 27) | Rbm27 Kiaa1311 | Q5SFM8 | 1 |
| RNA-binding protein 33 (Proline-rich protein 8) (RNA-binding motif protein 33) | Rbm33 Prr8 | Q9CXK9 | 1 |
| RNA-binding protein 40 (RNA-binding motif protein 40) (RNA-binding region-containing protein 3) | Rnpc3 Kiaa1839 Rbm40 | Q3UZ01 | 1 |
| RNA-binding protein 47 (RNA-binding motif protein 47) | Rbm47 | Q91WT8 | 1 |
| RNA-binding protein with multiple splicing 2 | Rbpms2 | Q8VC52 | 1 |
| Ropporin-1 (Rhophilin-associated 'oppo' protein) (Rhophilin-associated protein 1) | Ropn1 | Q9ESG2 | 1 |
| rRNA methyltransferase 1, mitochondrial (EC 2.1.1.-) (Mitochondrial large ribosomal RNA ribose methylase) | Mrm1 | Q99J25 | 1 |
| rRNA-processing protein FCF1 homolog | Fcf1 | Q9CTH6 | 1 |
| RUN and FYVE domain-containing protein 1 (Rab4-interacting protein) | Rufy1 Rabip4 | Q8BIJ7 | 1 |
| RUN domain-containing protein 3A (Rap2-interacting protein 8) (RPIP-8) | Rundc3a Rap2ip Rpip8 | O08576 | 1 |
| S-methylmethionine--homocysteine S-methyltransferase BHMT2 (SMM-hcy methyltransferase) (EC 2.1.1.10) (Betaine--homocysteine S-methyltransferase 2) | Bhmt2 | Q91WS4 | 1 |
| S-phase kinase-associated protein 1 (Cyclin-A/CDK2-associated protein p19) (S-phase kinase-associated protein 1A) (p19A) (p19skp1) | Skp1 Skp1a | Q9WTX5 | 1 |
| S100P-binding protein | S100pbp | Q9D5K4 | 1 |
| SAC3 domain-containing protein 1 (SAC3 homology domain-containing protein 1) | Sac3d1 Shd1 | A6H687 | 1 |
| SAM and SH3 domain-containing protein 1 | Sash1 | P59808 | 1 |
| SAP30-binding protein (Transcriptional regulator protein HCNGP) | Sap30bp Hcngp | Q02614 | 1 |
| Sarcolemmal membrane-associated protein (Sarcolemmal-associated protein) | Slmap Kiaa1601 Slap | Q3URD3 | 1 |
| SAYSvFN domain-containing protein 1 | Saysd1 | Q8K190 | 1 |
| Scaffold attachment factor B1 (SAF-B1) | Safb Safb1 | D3YXK2 | 1 |
| Scaffold attachment factor B2 (SAF-B2) | Safb2 | Q80YR5 | 1 |
| Scavenger receptor class A member 3 | Scara3 | Q8C850 | 1 |
| Scavenger receptor class A member 5 | Scara5 | Q8K299 | 1 |
| Sec1 family domain-containing protein 1 (Syntaxin-binding protein 1-like 2) | Scfd1 Stxbp1l2 | Q8BRF7 | 1 |
| SEC14 domain and spectrin repeat-containing protein 1 (Huntingtin-interacting protein-like protein) | Sestd1 | Q80UK0 | 1 |
| Secernin-2 | Scrn2 | Q8VCA8 | 1 |
| Secreted frizzled-related protein 5 (sFRP-5) | Sfrp5 | Q9WU66 | 1 |
| Secreted seminal-vesicle Ly-6 protein 1 (SSLP-1) | Sslp1 Gm191 | Q3UN54 | 1 |
| Secretory phospholipase A2 receptor (PLA2-R) (PLA2R) (180 kDa secretory phospholipase A2 receptor) (M-type receptor) [Cleaved into: Soluble secretory phospholipase A2 receptor (Soluble PLA2-R) (Soluble PLA2R)] | Pla2r1 Pla2g1br | Q62028 | 1 |