The distributions of perikarya exhibiting human somatocrinin (hGHRF) and neuropeptide Y (NPY) like immunoreactivities (IR) were compared in the arcuate nucleus of colchicine-treated rats. The majority of hGHRF perikarya was found to exhibit simultaneously NPY IR, while virtually no NPY IR was detected in the external layer of the median eminence. It is suggested that the majority of the hGHRF neurons of the rat arcuate nucleus constitutes a tubero-extra-infundibularly projecting system.
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Ciofi et al. (2008) studied this question.
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