Abstract
The distribution of biogenic amines in the young pluteus of Psammechinus miliaris Gmelin was examined by means of the histochemical fluorescence method of Falck and Hillarp. Two different systems where monoamines occur were detected. Catecholamines were mainly found in a presumably impulse propagating neuron-like system, while 5-HT (serotonin) was predominantly localized in the endoderm wall. The results are discussed in relation to the ontogeny and phylogeny of sea urchins.
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