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Rowitch, David H., Benoit St.-Jacques, Scott M. K. Lee, Jonathon D. Flax, Evan Y. Snyder, e Andrew P. McMahon. "Sonic Hedgehog Regulates Proliferation and Inhibits Differentiation of CNS Precursor Cells." J Neurosci 1999.

Rowitch, David H., et al. "Sonic Hedgehog Regulates Proliferation and Inhibits Differentiation of CNS Precursor Cells." J Neurosci 1999.