TY - RPRT TI - Sister-chromatid exchanges but not mutations decrease with time in arrested Chinese hamster ovary cells after treatment with ethylnitrosourea. AU - R F Jostes DO - 10.1016/0165-7992(81)90017-8 UR - https://pubmed.ncbi.nlm.nih.gov/7196497/ ID - 7196497 ER -