Abstract
Methionine-enkephalin (Met-enk) was detected by immunocytochemistry and radioimmunoassay in the caudal neuro-secretory system of the carp Cyprinus carpio. Some cells showing urotensin I (UI)-immunoreactivity reacted to Met-enk antiserum, but others did not. Neurons with urotensin II (UII)-immunoreactivity did not react to Met-enk antiserum; neurons with both UI and UII immunoreactivities also displayed a negative Met-enk reaction. Met-enk was detected by radioimmunoassay in the urophysis, although the content was relatively small compared with that found in other parts of the central nervous system and in the pituitary.
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