when permeable normal human fibroblasts ( nhf ) were incubated in a dna-repair assay mixture lacking the deoxyribonucleoside triphosphate precursors , the numbers of uv-dependent dna-strand breaks were increased by about 9-fold consistent with the uncoupling of incision from gap-filling dna synthesis and ligation .
C0012854
dna
C0598312
dna