the yield of sister-chromatid exchanges ( sces ) in the 3h-dthd pretreated cells was less than the yield induced by gamma-rays alone ( protective effects ) , and the micronucleus frequency was less than the sum of the induced frequencies by 3h-dthd and gamma-rays separately ( below-additivity effects ) .
C0037211
sister-chromatid exchanges
C0007634
cells