| ATR | acid tolerance response |
|---|---|
| ATR | against the rule |
| ATR FT-IR | Attenuated total reflection Fourier transform infrared spectroscopy |
| ATR-FTIR | Attenuated Total Reflectance Fourier-Transform Infrared |
| ATR-FTIR | Attenuated total reflection Fourier transform infrared |
| ATRA | All Trans Retinoic Acid |
| ATRA | All-trans RA |
| ATS | American Thoracic Society |
| ATS | Anti-thymocyte serum |
| ATS | anti-rat thymocyte serum |