| Business | Phone |
| Allergy & Asthma Research 9900 N Central Expy 555, Dallas 75231 | (214) 365-0365 |
| Marnac Inc 9400 N Central Expy 305, Dallas 75231 | (214) 692-8544 |
| Pharmaceutical Research & Cslt 5499 Glen Lakes Dr 200, Dallas 75231 | (214) 361-5555 |
| Research Institute Of Dallas 10260 N Central Expy 100, Dallas 75231 | (214) 265-2137 |
| Ppd 6302 Malcolm Dr, Dallas 75214 | (214) 223-6839 |