Letters from: [ Michael Joffe ][1] [ John A. McLachlan ][1] The report by S. F. Arnold et al . ([7 June, p. 1489][2]) demonstrating an increase in potency of weakly estrogenic compounds when used in combination has aroused considerable interest. A number of aspects of the report, however, are
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Joffe et al. (1996) studied this question.
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