pretreatment with low doses of beta-rays from incorporated tritiated thymidine ( [ 3h ] dthd ) or of co-60 gamma-rays ( 1 or 5 cgy ) rendered actively growing chinese hamster v79 cells more resistant to the induction of micronuclei or sister-chromatid exchanges ( sces ) by a subsequent high dose of gamma-rays ( 1 gy ) .
C0007634
cells
C0037211
sister-chromatid exchanges