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Cytotoxicity of bromodeoxyuridine (BrdU) and ethynyldeoxyuridine (EdU) to Chinese hamster ovary (CHO) cells. CHO cell survival against BrdU or EdU in the presence (a); or absence (b) of nucleotide/nucleoside supplement. Open circles indicate EdU and closed circles indicate BrdU. Error bars represent the standard error of the mean of three independent experiments.
