on the basis of quantitative cr determinations in the treatment solutions and in the treated cells , the cytotoxic effects of cr are attributed to the action of cr ( 6+ ) at the plasma membrane level on the mechanisms involved in nucleoside uptake , and to the interaction of cr ( 3+ ) at the intracellular level with nucleophilic targets on the dna molecule .
C0007634
cells
C0007603
plasma