FIGURE 1. Pitx1 is expressed in the prospective pelvic region of marine but not Paxton Lake benthic sticklebacks.
From the following article:
Michael D. Shapiro, Melissa E. Marks, Catherine L. Peichel, Benjamin K. Blackman, Kirsten S. Nereng, Bjarni Jónsson, Dolph Schluter and David M. Kingsley
Nature 439, 1014 (23 February 2006)
doi:10.1038/nature04500
a, Whole-mount in situ hybridization shows Pitx1 expression in the mouth, jaw and pelvic buds of stage-29 marine larvae. (Details are available from the corresponding author, D.M.K.) c, d, Enlarged views of the lateral head (c) and ventral pelvis (d) of stage-29 marine larvae; arrowheads indicate sites of expression. b, e, f, In Paxton benthic larvae, Pitx1 expression is absent from the prospective pelvic region (f), but is present in the mouth and jaw (e, arrowheads). Scale bars, 1 mm; pect, pectoral fin.