Dawid IB .

Figure 1. Early Development in X. laevisAfter fertilization, dorsal determinants are transported from the vegetal pole to one side of the embryo, where β-catenin will achieve nuclear localization. By 32 cells, the row of cells labeled 1 is specified as dorsal. Movements towards the vegetal pole (arrow) start at early cleavage stages. The organizer forms from C1 and B1 progenitors, the dorsal ectoderm or BCNE mostly from A1 progenitors (see Figure 2). The organizer is indicated in the gastrula embryo. See the text for further explanation.

Figure 2. Expression Patterns in Dorsal EctodermExpression patterns of selected genes in the late blastula of Xenopus, based on the work of Kuroda et al. (2004). See the text for further explanation.

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