A, B, The VISTA plot of approximately 300 kb (A) span around the mouse Phox2b gene and the 20 kb (B) region closest to the gene are shown. The plot shows conserved sequences between mouse and rat, human, opossum, chicken, painted turtle, Xenopus, coelacanth, spotted gar, and zebrafish. Abscissa: mouse sequence, ordinate: percent identity in a 50-bp window. The conserved regions above the level of 60%/50 bp are highlighted under the curve, with pink indicating conserved non-coding sequence (CNS), blue indicating conserved exon, and cyan indicating untranslated region. The approximate position of the mouse BAC clone RP24-95M11 is shown in grey at the top of panel A. In A and B, numbers at the bottom of the plot indicate positions relative to the analyzed 540-kb mouse genome fragment (chromosome:GRCm38:5:66826857 (set as position 1)-67366858).