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Abstract
Sonic hedgehog (Shh) plays critical roles during nervous system development, yet little is known about its function in the sympathetic nervous system. Using a mouse Shh null line, we examined the roles of Shh during SNS development. Loss of Shh did not prevent formation of the sympathetic trunk, but the ganglia are hypoplastic and misspatterned. Neuronal differentiation was delayed in Shh mutant embryos showing that Shh is required for correct developmental timing in addition to its role in sympathetic nervous system patterning. Immunohistochemical analyses of the ganglia for expression of the pan-neuronal marker beta3-tubulin, the noradrenergic biosynthetic enzyme tyrosine hydroxylase and the glial marker B-FABP showed that Shh is not required for differentiation of sympathetic neurons or glia.
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