Ectopic expression of bioactive peptides and serotonin in the sacciform gland cells of teleost skin.

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Abstract
Immunohistochemical methods identified serotonin, and the peptides bombesin and caerulein, in the skin of the teleosts Lepadogaster candollei and Mastacembelus erytrotaenia. In both species, the secretory content of epidermal sacciform cells reacted positively for all three substances. These results are compared with studies on the skin glands of amphibians, which also contain multiple active compounds, and on various neuroendocrine cells of fish. The precise functions of the secretions are not known.

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