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. 2003 Dec;122(6):749–760. doi: 10.1085/jgp.200308823

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Copyright © 2003, The Rockefeller University Press

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Figure 3. — Sequence comparison of the pore region among CNG channel subunits. Residues that are identical to that found in CNGA2 are shaded. The 10 residues different between CNGA2 and A3 that were mutated in this study are boxed. The black circle represents the site of glycosylation in CNGA1. Structural features (e.g., pore turret and helix, and the selectivity filter [SF]) are predicted based on the structure of the KcsA channel.