| ANAS | anastomosis; auditory nerve activating substance |
|---|---|
| ARAS | ascending reticular activating system |
| ATF | activating transcription factor; anterior talofibular [ligament]; ascites tumor fluid |
| CTAP | computed tomography in arterial portography; connective tissue activating peptide |
| ENA | epithelial neutrophil-activating [protein]; extractable nuclear antigen |