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(A) D3 immunoreactive fibers (arrowheads) are present in the human infundibular stalk (IS); these fibers are shown in medium (B) and high (inset in A) power micrographs. opt: tractus opticus, VMH: ventromedial hypothalamic nucleus, III: third ventricle Scale bars: 500 µm in A, 50 µm in B, 10 µm in inset.
