Biological variation of retinoids in man.

Abstract excerpt

This investigation was undertaken to assess biological variation, especially the within-subject variations of all-trans retinoic acid, 13-cis retinoic acid and retinol in human serum. Diurnal variation and variation over a week, a month and a year were studied in 11 males (aged 21-54 years) and 17 females (aged 22-63 years), all subjectively healthy. We found no diurnal variation with the exception of all-trans...

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