Fig. 1. SLC20A1 expression in Xenopus laevis embryos. Whole-mount in situ hybridization with the indicated DIG-labeled antisense probes was performed on embryos at the indicated stages (Nieuwkoop and Faber, 1997). (AâC) Lateral views of embryos with anterior towards the left. (DâI) High magnification views of the pronephric region. Arrows indicate SLC20A1 expression in the late distal tubule compartment of the developing pronephros. Abbreviations: dl, distal late pronephric compartment; de, distal early pronephric compartment; e, eye; nc, neural crest; np, neural plate; p, proximal pronephric compartment; s, somites.