Additional File 1.

Complementary SHH and NOGO-A gene expression in the HH6 chick embryo. NOGO-A expression is prominent in the neural tissue surrounding the notochord and within the right side of the primitive node (Hensen's node). SHH is complementarily expressed having intense expression within the notochord and overlying neural tissue and also within the left side of the primitive node. Scale bar 250 μm.

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Caltharp et al. BMC Developmental Biology 2007 7:32   doi:10.1186/1471-213X-7-32