Simultaneous fluorescence histochemical demonstration of catecholamines and tryptophyl-peptides in endocrine cells.

Simple and efficient fluorescence histochemical methods for the concomitant demonstration of tryptophyl-peptide-containing cells and dopamine-containing cells have been developed in this study. Combined formaldehyde and chloral vapour or solution of 5% glyoxylic acid monohydrate in n-butanol induced concomitantly strong yellow fluorescence in the tryptophyl-peptide-containing cells and moderate green fluorescence in the dopamine-containing cells in the sections of the freeze-dried adenohypophysis.