CLOCKS REGULATING DEVELOPMENTAL PROCESSES

Developmental clocks are hypothetical embryonic time-measuring devices - some are run by oscillators, whereas others depend on rate-limiting processes. Their existence has been deduced from recent studies of th e timing of the midblastula transition, the opening of the Hox cluster during organogenesis, and oligodendrocyte progenitor differentiation; however, the mechanisms underlying their function remain largely unkn own.