There are multiple definitions:

1. anhydrotetracyclin(English)

   • IPTG

2. aurintricarboxylic acid(English)

   • inhibitor of apoptosis
   • Apoptosis

3. Athletic Trainer Certified(English)

   • Exercise & Training

4. Anatomical Therapeutic Chemical(English)

   • classification code of drugs
   • DDD, WHO
   • Classification, Pharmacology / pharmaceutics
   • https://www.who…/atc_ddd_index/
   • https://doi.org…2859-017-1660-6

5. anaplastic thyroid carcinoma(English)

   • a rare, aggressive, and rapidly growing form of thyroid cancer with a poor prognosis. It is characterized by a fast-growing neck mass that can cause symptoms like dysphagia, dyspnea, and hoarseness
   • EGFR, RTK, TC
   • Thyroid and parathyroid, Oncology
   • https://doi.org…bcp.2025.117448