sister chromatid exchange frequencies in both v79 and chinese hamster ovary cells remained unchanged by tpa treatment under various conditions , a result inconsistent with the hypothesis that an important effect of tpa might be to increase the rate of chromosomal mitotic recombination ( and hence segregation of recessive mutations ) in a manner akin to increased chromatid recombination .
C0008633
chromosomal
C0008545
chromatid