Ava E. Brent and Clifford J. Tabin are in the Department of Genetics, Harvard Medical School, 77 Avenue Louis Pasteur, Boston, Massachusetts 02115, USA. tabin@genetics.med.harvard.edu
In zebrafish, slow twitch muscle is specified from a somitic muscle precursor pool by local Hedgehog (Hh) signals. A new study identifies the transcription factor Blimp-1 as a key downstream mediator in this process.
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