| Abbreviations | Meaning |
 | PAA | Phenylacetic Acid |
| PGA | Pteroylglutamic Acid |
| LSD | Lysergic Acid Diethylamide |
| CCCDNA | Covalently Closed Circular Deoxyribonucleic Acid |
| HARS | Histidyl-ribonucleic Acid [RNA] Synthetase; Human AIDS [acquired Immunodeficiency Syndrome] Reporting System |
| RNAI | Ribonucleic Acid Interference |
| MMA | Methylmalonic Acid |
| SFA | Serum Folic Acid |
| ASM | Acid Sphingomyelinase |
| LAD | Lactic Acid Dehydrogenase |
| A | Abnormal; Abortion; Absolute Temperature; Absorbance; Acceptor; Accommodation; Acetone; Acetum; Achondroplasia; Acid; Acidophil, Acidophilic; Acromion |
| ACA | American College Of Apothecaries; American Council On Alcoholism; American Counseling Association; Aminocephalosporanic Acid |
| RNA | Ribonucleic Acid |
| HPPA | Hydroxyphenylpyruvic Acid |
| POLY-DA, POLY(DA) | Polydeoxyadenylic Acid |
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