the results of these studies suggest ( 1 ) that an inverse relationship exists between sister chromatid exchange induction and mitogenic response , ( 2 ) that cells from older animals may have an increased sensitivity to high levels of dna damage ( 5 mg/kg mmc ) , and ( 3 ) that this sensitivity may be expressed functionally by increased inhibition of in vitro mitogenic responses .
C0037211
sister chromatid exchange
C0007634
cells