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High-power photomicrographs illustrate the colocalization of AT1A receptor mRNA expression with tyrosine hydroxylase immunoreactivity in neurons of the arcuate nucleus of estrogen/progesterone-treated OVX rats (arrows). B shows a polarized epifluorescence illumination of A to visualize silver grains. Note the absence of silver grains over one tyrosine hydroxylase-positive neuron (arrowhead). Scale bar, 20 μm.
