| Identifier | Protein names | Gene names | Cross reference refseq | Length | Species |
| Q2KIP6 | Kappa-type opioid receptor; K-OR-1; KOR-1; | OPRK1; | NP_001039945.1; | 380 | cow |
| P79350 | Mu-type opioid receptor; M-OR-1; MOR-1; | OPRM1; | NP_776833.1; | 401 | cow |
| P51490 | Short-wave-sensitive opsin 1; Blue cone photoreceptor pigment; Blue-sensitive opsin; BOP; | OPN1SW; BCP; | NP_776992.1; | 349 | cow |
| P02699 | Rhodopsin; | RHO; | NP_001014890.1; | 348 | cow |
| Q9BGI7 | Long-wave-sensitive opsin 1; Red cone photoreceptor pigment; Red-sensitive opsin; | OPN1LW; RCP; | NP_776991.1; | 364 | cow |
| P58874 | Opticin; Oculoglycan; | OPTC; OPT; | NP_991339.1;XP_005216715.1; | 321 | cow |
| Q58DC8 | Origin recognition complex subunit 1; | ORC1; ORC1L; | NP_001014918.1;XP_005204602.1;XP_005204603.1; | 863 | cow |
| A6QNM3 | Origin recognition complex subunit 2; | ORC2; ORC2L; | NP_001095412.1; | 577 | cow |
| Q32PJ3 | Origin recognition complex subunit 3; | ORC3; ORC3L; | NP_001033228.1; | 712 | cow |
| Q2YDI2 | Origin recognition complex subunit 4; | ORC4; ORC4L; | NP_001039766.1;XP_005202501.1; | 436 | cow |
| Q2HJF3 | Origin recognition complex subunit 6; | ORC6; ORC6L; | NP_001039666.1; | 252 | cow |
| P56717 | Orexin-A; Hypocretin-1; Hcrt1; | HCRT; OX PPOX; | NULL | 33 | cow |
| Q29RQ9 | ORM1-like protein 1; | ORMDL1; | NP_001070601.1;XP_005202286.1;XP_005202287.1; | 153 | cow |
| Q5E972 | ORM1-like protein 2; | ORMDL2; | NP_001014931.1;XP_005206638.1;XP_005206639.1; | 153 | cow |
| Q0VD15 | ORM1-like protein 3; | ORMDL3; | NP_001069835.1;XP_005220810.1;XP_005220811.1;XP_005220812.1; | 153 | cow |
| A2VE52 | Oligoribonuclease, mitochondrial; EC 3.1.-.-; RNA exonuclease 2 homolog; Small fragment nuclease; | REXO2; | NP_001075204.1; | 237 | cow |
| Q3MHX6 | Protein OS-9; | OS9; | NP_001029397.1; | 667 | cow |
| Q29S00 | Protein OSCP1; | OSCP1; | NP_001039369.1; | 379 | cow |
| Q5E9A0 | Oxidative stress-responsive serine-rich protein 1; Oxidative stress-responsive protein 1; Peroxide-inducible transcript 1 protein; | OSER1; | NP_001015568.1;XP_005214700.1;XP_005214701.1; | 291 | cow |
| Q0VCI1 | Probable tRNA N6-adenosine threonylcarbamoyltransferase; EC 2.6.99.4; N6-L-threonylcarbamoyladenine synthase; t(6)A synthase; O-sialoglycoprotein endopeptidase; t(6)A37 threonylcarbamoyladenosine biosynthesis protein OSGEP; tRNA threonylcarbamoyladenosine癷?癸 | OSGEP; | NP_001068787.1; | 335 | cow |
