all-trans-retinoic acid ( ra ) in olive oil was given in doses of 0 , 40 , or 60 mg/kg of body weight to pregnant mice on day 8 of gestation , and 2-6 hr later embryos were fixed in solutions with or without cetylpyridinium chloride ( cpc ) .
C0040845
all-trans-retinoic acid
C0032961
gestation