Key points are not available for this paper at this time.
SummaryNychthemeral variations in levels of plasma free corticosteroids in the rat have been observed, with highest concentrations of steroid between 4 p.m. and midnight. The magnitude of these cyclic variations is such that they will have to be considered in measurement of "resting levels" of plasma corticosteroids in this species.
Guillemin et al. (Mon,) studied this question.