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Primary structure of the rat CNG4.3 subunit. (Upper) Scheme of the coding region of CNG4.3. The putative transmembrane segments (1–6), the pore (P), and the cyclic nucleotide-binding domain (CNBD) are indicated. The unique N terminus of CNG4.3 is represented as an open box. (Lower) Amino acid sequence of CNG4.3. The unique N terminus encoded by exon β4a is boxed. The transmembrane segments, the pore region, and CNBD are underlined.
