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iso·tret·i·no·in

n :  a synthetic vitamin A derivative C20H28O2 that inhibits sebaceous gland function and keratinization and that is used in the treatment of acne but is contraindicated in pregnancy because of implication as a cause of birth defects - see ACCUTANE  .
 
 

 
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Boone County Hospital (Boone, Iowa - Boone County)