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Expression of mHCN1, mHCN2, and mHCN4 transcripts in midbrain. A, Coronal section (bregma, −4.04) showing mHCN1 labeling in the superior colliculus. B, mHCN2 labeling in the superior colliculus. C, Coronal section (bregma, −3.28) showing staining for mHCN2 in substantia nigra, pars reticulata (snr). D, Staining for mHCN4 in substantia nigra, mostly pars compacta (snc). Scale bars, 500 μm.
