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Somitogenesis compared between different vertebrate models. In the corn snake, more stripes of cyclic gene expression are seen simultaneously in the presomitic mesoderm and many more smaller-sized somites are formed because the rate of the somite clock is accelerated. Dotted line indicates the position of the determination front. Anterior is to the top, posterior to the bottom. PSM, presomitic mesoderm. Redrawn from [48].
