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Fluorophores induced from noradrenaline and dopamine in tissue sections by treatment with formaldehyde can be separated by their different behavior upon HCl treatment. The noradrenaline fluorophore converts to a fully aromatic isoquinoline while the dopamine fluorophore remains in the form of a nonquinoidal dihydroisoquinoline. The two fluorophores have readly distinguishable excitation spectra. The procedure has been tested both in model systems and in tissue sections. The microspectrofluorometer used is described.

A METHOD FOR DIFFERENTIATING DOPAMINE FROM NORADRENALINE IN TISSUE SECTIONS BY MICROSPECTROFLUOROMETRY