Figure 8.

Comparison of vertebrate nephron segmentation models. Schematic representations of (a) the original model, (b) the improved model of Zhou and Vize [19], and (c) our novel model of pronephric nephron segmentation in the stage 35/36 Xenopus embryo. For comparison, (d) a simplified scheme of the model of the segmental organization of the mammalian metanephric nephron, according to Kriz and Bankir [2], is shown. The glomerulus and nephrostomes (neck segments) are not shown. Abbreviations: DE, distal early; DL, distal late; PE, proximal early; PL, proximal late. For other abbreviations, see the legends to Figure 2.