Leydig cells in the lingual epithelium of the axolotl, Ambystoma mexicanum, are immunoreactive for serotonin.

The Leydig cells in the lingual epithelium of the axolotl were investigated by immunohistochemistry using serotonin antiserum. Serotonin-immunoreactivity was found in their secretory granules. The physiological role of serotonin in the Leydig cell, a type of exocrine cell, is unknown.

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