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(A) Low power photomicrograph of a hemisection of the midbrain at the level of the red nucleus (R Nuc) immunostained with tyrosine hydroxylase antibody. The substantia nigra (SN) is present laterally and the paranigral nucleus of the ventral tegmental area (arrowhead) is present medially and is traversed by the exiting third nerve fibres. The paranigral nucleus having high (B) and low (C) density of neurons is shown. Scale bar = 125 μm.
