| ABR | active BCR-related | 55 |
| ACAP3 | ArfGAP with coiled-coil, ankyrin repeat and PH domains 3 | 1 |
| ACRC | acrosin | 1 |
| ACTN2 | actinin, alpha 2 | 40 |
| ACVR1C | activin A receptor, type IC | 1 |
| ACVR2B | activin A receptor, type IIB | 13 |
| ADAM33 | ADAM metallopeptidase domain 8 | 1 |
| ADAP1 | ArfGAP with dual PH domains 1 | 1 |
| ADAP2 | ArfGAP with dual PH domains 2 | 1 |
| ADCY1 | adenylate cyclase 1 (brain) | 30 |
| ADCY2 | adenylate cyclase 2 (brain) | 20 |
| ADCY4 | adenylate cyclase 4 | 11 |
| ADCY5 | adenylate cyclase 5 | 10 |
| ADCY8 | adenylate cyclase 8 (brain) | 30 |
| ADCY9 | adenylate cyclase 9 | 10 |
| ADCYAP1 | adenylate cyclase activating polypeptide 1 (pituitary) | 64 |
| ADCYAP1R1 | adenylate cyclase activating polypeptide 1 (pituitary) receptor type I | 21 |
| ADD2 | adducin 2 (beta) | 41 |
| ADORA3 | adenosine A3 receptor | 9 |
| ADRA1A | adrenoceptor alpha 1A | 31 |
| ADRA2A | adrenoceptor alpha 2A | 10 |
| ADRA2B | adrenoceptor alpha 2B | 30 |
| ADRA2C | adrenoceptor alpha 2C | 10 |
| ADRB1 | adrenoceptor beta 1 | 20 |
| ADRB3 | adrenoceptor beta 3 | 51 |
| AGAP1 | ArfGAP with GTPase domain, ankyrin repeat and PH domain 1 | 1 |
| AGAP2 | ArfGAP with GTPase domain, ankyrin repeat and PH domain 2 | 1 |
| AGFG1 | ArfGAP with FG repeats 1 | 1 |
| AGTR1 | angiotensin II receptor, type 1 | 10 |
| AHSA2 | AHA1, activator of heat shock 90kDa protein ATPase homolog 2 (yeast) | 9 |
| AKT1 | v-akt murine thymoma viral oncogene homolog 1 | 9 |
| ALKBH4 | anaplastic lymphoma receptor tyrosine kinase | 1 |
| ALOX12B | arachidonate 12-lipoxygenase | 9 |
| ALS2CR2 | STE20-related kinase adaptor beta | 9 |
| AMH | anti-Mullerian hormone | 30 |
| ANG | angiogenin, ribonuclease, RNase A family, 5 | 21 |
| ANK2 | ankyrin 2, neuronal | 21 |
| ANKRD27 | ankyrin repeat domain 27 (VPS9 domain) | 1 |
| ANXA3 | annexin A3 | 20 |
| APOA1 | apolipoprotein A-I | 13 |
| APOA4 | apolipoprotein A-IV | 20 |
| ARAF | v-raf murine sarcoma 3611 viral oncogene homolog | 10 |
| ARAP2 | ArfGAP with RhoGAP domain, ankyrin repeat and PH domain 2 | 1 |
| ARFGAP1 | ADP-ribosylation factor GTPase activating protein 1 | 10 |
| ARHGAP21 | Rho GTPase activating protein 21 | 9 |
| ARHGAP22 | Rho GTPase activating protein 22 | 1 |
| ARHGAP27 | Rho GTPase activating protein 27 | 1 |
| ARHGAP4 | Rho GTPase activating protein 4 | 1 |
| ARHGAP6 | Rho GTPase activating protein 6 | 1 |
| ARHGAP9 | Rho GTPase activating protein 9 | 1 |
