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Adjacent coronal sections of a P6 striatum.A, Ephrin-A4–Fc binding is distributed in a mosaic pattern that contains striosomes lacking binding (large arrowheads). Binding also is absent in the subcallosal streak (small arrowheads). B, μ-Opioid receptor immunohistochemistry in an adjacent section illustrates dense reactivity in areas that correspond to the striosomes (large arrowheads) and subcallosal streak (small arrowheads). Scale bar, 500 μm.
