PTO means Patent and Trademark Office U.S. Department of Commerce in FDA
Similar to PTO
ACSM - American College of Sports MedicineACT - AIDS Clinical Trials
ACT - Applied Clinical Trials
ACTB (NCTR) - Analytical Chemical Techniques Branch NCTR
ACTH - AdrenoCorticoTropic Hormone
ACTIS - Aids Clinical Trials Information Service
ACUS - Administrative Conference of the United States
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