| Identifier | Protein names | Gene names | Cross reference refseq | Length | Species |
| P11180 | Dihydrolipoyllysine-residue acetyltransferase component of pyruvate dehydrogenase complex; EC 2.3.1.12; Dihydrolipoamide acetyltransferase component of pyruvate dehydrogenase complex; Pyruvate dehydrogenase complex component E2; Fragment; | DLAT; | NULL | 10 | cow |
| A7MB35 | Pyruvate dehydrogenase E1 component subunit alpha, somatic form, mitochondrial; EC 1.2.4.1; PDHE1-A type I; | PDHA1; | NP_001094516.1; | 390 | cow |
| P11966 | Pyruvate dehydrogenase E1 component subunit beta, mitochondrial; PDHE1-B; EC 1.2.4.1; | PDHB; | NP_001030512.2; | 359 | cow |
| P22439 | Pyruvate dehydrogenase protein X component; Dihydrolipoamide dehydrogenase-binding protein of pyruvate dehydrogenase complex; E3-binding protein; E3BP; proX; | PDHX; PDX1; | NP_001069219.1; | 501 | cow |
| Q3MI03 | Prolyl 3-hydroxylase OGFOD1; EC 1.14.11.-; 2-oxoglutarate and iron-dependent oxygenase domain-containing protein 1; | OGFOD1; | NP_001160085.1; | 542 | cow |
| O46685 | Ovarian cancer G-protein coupled receptor 1; G protein-coupled receptor RGR1; bRGR1; G-protein coupled receptor 68; | GPR68; | NP_776754.1; | 361 | cow |
| Q29RU2 | Oncoprotein-induced transcript 3 protein; | OIT3; | NP_001039529.1; | 547 | cow |
| Q2HJ33 | Obg-like ATPase 1; | OLA1; | NP_001039510.1;XP_005202381.1; | 396 | cow |
| Q0VCP3 | Olfactomedin-like protein 3; | OLFML3; | NP_001068665.1; | 406 | cow |
| A6QLD2 | Olfactomedin-like protein 2B; | OLFML2B; | NP_001093824.1; | 759 | cow |
| P79391 | Oxidized low-density lipoprotein receptor 1; Ox-LDL receptor 1; Lectin-like oxidized LDL receptor 1; LOX-1; Lectin-like oxLDL receptor 1; bLOX-1; Lectin-type oxidized LDL receptor 1; [Cleaved into: Oxidized low-density lipoprotein receptor 1, soluble form癷?癸 | OLR1; LOX1; | NP_776557.1; | 270 | cow |
| Q3SZN3 | Metalloendopeptidase OMA1, mitochondrial; EC 3.4.24.-; Overlapping with the m-AAA protease 1 homolog; | OMA1; | NP_001030205.1;XP_005204593.1; | 523 | cow |
| O77742 | Osteomodulin; Keratan sulfate proteoglycan osteomodulin; KSPG osteomodulin; Osteoadherin; OSAD; | OMD; | NP_776372.1; | 422 | cow |
| P53346 | Oncostatin-M; OSM; | OSM; | NP_783644.3; | 245 | cow |
| A0JNQ6 | Oocyte-expressed protein homolog; | OOEP; | NP_001071337.1; | 140 | cow |
| Q2Q0J1 | Oocyte-secreted protein 1; | OOSP1; | NP_001033776.1; | 163 | cow |
| Q05B66 | Optic atrophy 3 protein homolog; | OPA3; | NP_001073073.1; | 191 | cow |
| Q5E9I3 | Opalin; Oligodendrocytic myelin paranodal and inner loop protein; Transmembrane protein 10; | OPALIN; TMEM10; | NULL | 142 | cow |
| P11834 | Opioid-binding protein/cell adhesion molecule; OBCAM; OPCML; Opioid-binding cell adhesion molecule; | OPCML; OBCAM OCAM; | NP_776832.1; | 345 | cow |
| Q75WB5 | 5-oxoprolinase; EC 3.5.2.9; 5-oxo-L-prolinase; 5-OPase; Pyroglutamase; | OPLAH; | NP_001001173.1; | 1288 | cow |
