| Acronym | Meaning |
 | AAAI | American Association ForArtificial Intelligence |
| AAAS | American Association For The Advancement Of Science |
| AACC | American Association For Clinical Chemistry |
| AACR | American Association For Cancer Research |
| AAI | American Association Of Immunologists |
| AAIP | American Association Of Investigative Pathologists |
| AANP | American Association Of Neuropathologists |
| AAP | Association Of American Physicians |
| ABA | Australian Biotechnol. Assoc. |
| ABI | Applied Biosystems |
| ABIC | Agricultural Biotechnology Intl. Conf. |
| ABRF | Association Of Biomolecular Resource Facilities |
| ACE | Angiotensin-converting Enzyme |
| ACEDB | A C. Elegans Database |
| ACMG | American College Of Medical Genet. |
| ACS | American Chemical Society |
| ADA | Americans With Disabilities Act |
| AEC | Atomic Energy Commission |
| AES | American Electrophoresis Society |
| AFIP/ARP | Armed Forces Inst. Of Pathol./Am. Registry Of Pathol. |
| AFMR | American Federation Of Medical Research |
| AGSG | Alliance Of Genetic Support Groups (now Genetic Alliance) |
| AGT | Association Of Genetic Technologists |
| AHA | American Heart Association |
| AIBS | Am. Inst. Of Biol. Soc. |
| AIDS | Acquired Immune Deficiency Syndrome |
| AMIA | American Medical Informatics Association |
| ANGIS | Australian National Genomic Info. Service |
| ANL | Argonne National Laboratory |
| API | Application Programming Interface |
| ARP | American Registry Of Pathology |
| ASB | American Society For Biotechnology |
| ASBMB | American Society For Biochemistry & Molecular Biology |
| ASCB | American Society For Cell Biology |
| ASCI | American Society For Clinical Investigation |
| ASHG | American Society For Human Genetics |
| ASIP | American Society For Investigative Pathologists |
| ASIS | American Society For Information Science |
| ASLME | American Society Of Law |
| ASM | American Society For Microbiology |
| ASPET | American Society For Pharmacology And Experimental Therapeutics |
| ATCC | American Type Culture Collection |
| ATP | Advanced Technology Program |
| AVS | American Vacuum Society |
| AWCH | Adelaide Women And Children's Hospital |
| BAC | Bacterial Artificial Chromosome |
| BACR | British Association For Cancer Research |
| BCM | Baylor College Of Medicine |
| BDG | Batten's Disease Gene |
| BER | Biological And Environmental Research |
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