“… PP ) concentration-… basal corticosterone and cyclic-AMP production of dispersed rat zona fasciculata/reticularis adrenocortical cells, maximal effective concentration being 10(-7) M. 10(-7) M PP … enhanced submaximally (10[-12]/10[-11] M), but not maximally (10[-9]/10[-8] M) ACTH-stimulated corticosterone and cyclic-AMP release.”