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Neutral ether extracts of the urine of both pregnant and nonpregnant lactating cows were examined spectrophotometrically. Certain similarities between the chromogens of cow urine and the 17-ketosteroids present in human urine were noted. The urinary excretion pattern of these chromogens displayed a distinct diurnal rhythm. Editor.
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Mixner et al. (1957) studied this question.
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