There are multiple definitions:

1. activating transcription factor(English)

   • CREB, PAR
   • Transcription
   • https://link.sp…40-29623-9_2180

2. Alcoholism Treatment Facility(English)

   • Alcohol, Addiction and health, Therapeutic approaches

3. amino-terminal fragment of urokinase(English)

4. anatomical tissue fraction(English)

   • represents the mass (density) of extravascular tissue in a ROI, and can be calculated by subtraction of blood volume image from transmission image
   • PTI, ROI
   • Medical imaging
   • http://www.turk…_h2o_heart.html

5. acoustic transfer function(English)

   • wideband measurements are used for assessment of middle ear function
   • SFOAE, OAE
   • Audiology, Auditory system
   • https://doi.org…179692.81851.3b