| Business | Phone |
| Physician Research Network 3119 Caroline St, Houston 77004 | (713) 773-1331 |
| Agennix Inc 8 E Greenway Plz 910, Houston 77046 | (713) 552-1091 |
| Benchmark Research Technology 17171 Park Row, Houston 77084 | (281) 579-1070 |
| Breath Of Life Research Ctr 1550 Foxlake Dr, Houston 77084 | (281) 579-8168 |
| Breco Clinical Research Inc 902 Frostwood Dr 223, Houston 77024 | (713) 973-6993 |
| Century Clinical Research 9898 Bissonnet St, Houston 77036 | (713) 777-7508 |
| Medsource Consulting 16902 El Camino Real 1a, Houston 77058 | (281) 286-2003 |
| Mercury Research Inc 6065 Hillcroft St, Houston 77081 | (713) 777-5343 |
| Juno Research 10101 Harwin Dr 300, Houston 77036 | (713) 779-5494 |
| Introgen Therapeutics Inc 2252 Holcombe Blvd, Houston 77030 | (713) 797-9960 |
| Neeman Medical Intl 5423 Cactus Forest Dr, Houston 77088 | (713) 791-9335 |