| Abbreviations | Meaning |
 | RNA | Radionuclide Angiography; Registered Nurse Anesthetist; Ribonucleic Acid; Rough, Noncapsulated, Avirulent [bacterial Culture] |
| PAA | Phenylacetic Acid |
| PPA | Polyphosphoric Acid |
| HCL | Hydrochloric Acid, Hydrochloride |
| GD-DTPA | Gadolinium-diethylene-triamine-pentaacetic Acid |
| AA | Alcoholics Anonymous; Allergic Alveolitis; Alopecia Areata; Alveolo-arterial; Aminoacetone; Amino Acid; Aminoacyl; Amyloid A |
| PAT | Picric Acid Turbidity |
| D | Absorbed Dose Aspartic Acid |
| EMTA | Endomethylene Tetrahydrophthalic Acid |
| ISS | Infantile Sialic Acid Storage [disease] |
| TRNA-I(MET) | Transfer Ribonucleic Acid Initiator Methionine |
| RNAI | Ribonucleic Acid Interference |
| ACPP | Adrenocortical Polypeptide; Prostate-specific Acid Phosphatase |
| APRP | Acidic Proline-rich Protein; Acute Phase Reactant Protein |
| ASAC | Acidified Serum-acidified Complement |
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