to evaluate the toxicological effects of chemicals on preimplantation mammalian embryos , pregnant rats were treated with chlorambucil ( 0 , 3 , 6 , and 12 mg/kg ip ) on day 1 , 2 , or 3 of gestation ( positive vaginal smear = day 0 ) .
C0008163
chlorambucil
C0032961
gestation