Abstract

The distribution of α-melantropin-like material (α-MSH) was determined in rat brain using a microdissection technique combined with radioimmunoassay. Highest concentrations of α-MSH were noted in the hypothalamus and preoptic area. Particularly high concentrations were observed in the arcuate nucleus, median eminence, suprachiasmatic nucleus, periventricular nucleus and the medial preoptic nucleus. The thalamic paraventricular nucleus also contained high α-MSH concentrations. Moderate to low concentrations were noted in other thalamic, septal, amygdaloid and midbrain nuclei. Low concentrations were observed in cortical and striatal regions.

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