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VT3 and VT4 receptor mRNA expression in nonneural areas in white-throated sparrow. Insets show Nissl-stained alternate sections from the same individuals. VT3 (OT-like) receptor mRNA was detected in the choroid plexus of the lateral, third, and tectal ventricles (arrows in A). In zebra finch, choroid plexus contained mRNA for VT1 (not depicted in figure). In sparrow, VT4 (V1a) receptor mRNA produced a strong signal in the pineal gland (box in B).
