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JOURNAL ARTICLES
Combinatorial signals from the neural tube, floor plate and notochord induce myogenic bHLH gene expression in the somite
A.E. Munsterberg, A.B. Lassar
Development 1995 121: 651-660;
A.E. Munsterberg
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A.B. Lassar
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Summary

The neural tube, floor plate and notochord are axial tissues in the vertebrate embryo which have been demonstrated to play a role in somite morphogenesis. Using in vitro coculture of tissue explants, we have monitored inductive interactions of these axial tissues with the adjacent somitic mesoderm in chick embryos. We have found that signals from the neural tube and floor plate/notochord are necessary for expression of the myogenic bHLH regulators MyoD, Myf5 and myogenin in the somite. Eventually somitic expression of the myogenic bHLH genes is maintained in the absence of the axial tissues. In organ culture, at early developmental stages (HH 11-), induction of myogenesis in the three most recently formed somites can be mediated by the neural tube together with the floor plate/notochord, while in more rostral somites (stages IV-IX) the neural tube without the floor plate/notochord is sufficient. By recombining somites and neural tubes from different axial levels of the embryo, we have found that a second signal is necessary to promote competence of the somite to respond to inducing signals from the neural tube. Thus, we propose that at least two signals from axial tissues work in combination to induce myogenic bHLH gene expression; one signal derives from the floor plate/notochord and the other signal derives from regions of the neural tube other than the floor plate.

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JOURNAL ARTICLES
Combinatorial signals from the neural tube, floor plate and notochord induce myogenic bHLH gene expression in the somite
A.E. Munsterberg, A.B. Lassar
Development 1995 121: 651-660;
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JOURNAL ARTICLES
Combinatorial signals from the neural tube, floor plate and notochord induce myogenic bHLH gene expression in the somite
A.E. Munsterberg, A.B. Lassar
Development 1995 121: 651-660;

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