Fig. 1

Alignment of amino acid sequences of rana (American bullfrog), xeno (tropical clawed frog), fish (zebrafish), chick and gerbil prestin. Different colors had been used to represent identity of each residue among two species. Red block: Full identity at a residue; red letter: Partial identity at a residue; Black: complete disparity at a residue. Gaps in the aligned sequences were indicated by the dashed line