Figure 1.
Partial sequence alignment of potassium channel MthK, NaK, NaK2CNG chimeras, CNG channels of Drosophila, mosquito, housefly, human, and bovine. Residues conserved in all channels are shaded in violet. Boxed in red are the selectivity filter sequences. Residues shaded in orange in the NaK sequence are replaced, respectively, by the shaded residues in CNG channels.