A new methodological approach to the fluorescence microscopical visualization of biogenic monoamines, based on condensation with gaseous glyoxylic acid, is presented. Glyoxylic acid treatment seems both to be more sensitive for the well‐known biogenic catecholamines and indolamines, and to allow the detection of other biogenic amines—such as melatonin—which are not demonstrable with available techniques.
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Axelsson et al. (1973) studied this question.
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