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Random mutagenesis of human topoisomerase II α cDNA followed by functional expression in yeast cells lacking endogenous topoisomerase II activity in the presence of ICRF-187, identified five functional mutations conferring cellular bisdioxopiperazine resistance. The mutations L169F, G551S, P592L, D645N, and T996L confer >37, 37, 18, 14, and 19 fold resistance towards ICRF-187 in a 24 h clonogenic...
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