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- Abbott
- Ablynx
- AbbVie
- Abraxis Pharmaceutical Products
- Academy Biomedical Company
- Access Pharmaceuticals
- Accredo Health Group
- Actavis
- ActiVery
- Adolor
- Advanced ChemTech
- Advancis Pharmaceutical
- Ahngook Pharmaceutical
- Akzo Nobel
- Aldevron
- Alexion Pharmaceuticals, Inc.
- Alfacell Corporation
- Alkermes
- Allergan
- allegropharm
- Allos Therapeutics
- Alpha Therapeutic Corporation
- Alpharma Inc.
- AlphaRx
- Alteon
- Alva-Amco Pharmacal, Inc.
- ALZA
- Amgen Inc.
- Amylin Pharmaceuticals
- Anavex Life Sciences Corp.
- Anika Therapeutics, Inc.
- Apotex, Inc.
- Apothecus Pharmaceutical Corp.
- Aradigm Corporation
- Arena
- Astellas Pharma, Inc.
- AstraZeneca
- AtheroGenics
- Avant Immunotherapeutics
- Axcan Pharma
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