Preventing the loss of competence for neural induction: HGF/SF, L5 and Sox-2
1997
for the forebrain, hindbrain or spinal cord. Although HGF/SF secreting cells can mimic signals from Hensen’s node that maintain L5 expression, they cannot rescue the ability of the node to induce anterior structures (which is normally lost after stage 4). The ectoderm may acquire stable neural characteristics during neural induction by going through a hierarchy of states: competence, neuralization and regionalization. Our findings allow us to start to define these different states at a molecular level, and show that the competence to respond to neural induction is not entirely autonomous to the responding cells, but can be regulated by extracellular signalling molecules. SUMMARY
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