Abstract
The densities of platelet 3H-imipramine sites were determined by repetitive measures of 11 normal controls over the course of 1 year. A significant seasonal variation was found, with a circannual peak on February 17 and a nadir on August 18, The estimated amplitude of this rhythm was ±599.5 fmol/mg, which fluctuated about a yearly mean of 2647.5 fmol/mg. The present results underscore the importance of including seasonally matched controls in the evaluation of potential patient differences in platelet binding.
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