Abstract
It is been widely assumed that the “segmentation clock” controls the timing of somite formation, or the size of individual somites, or both. However it is possible experimentally to generate somites that form neither in orderly head–tail sequence nor in a neat row. This suggests that it is possible to separate somite formation from a somitogenesis clock. What appears to go wrong in these apparently clockless somites is the partition of each somite into rostral and caudal halves: markers for these are inappropriately expressed. It also appears that somites generated without the clock have very specific axial identities. These findings suggest that the major functions of the “segmentation clock” are to impart positional addresses along the axis and to pattern individual somites into rostral and caudal halves.
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