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The Hedgehog-BMI1 Pathway . The Hedgehog (Hh) pathway regulates adult stem cell quiescence and self-renewal. Three Hh ligands have been identified in mammals, Sonic hedgehog (Shh), Desert hedgehog (Dhh), and Indian hedgehog (Ihh), of which Shh is the best studied. In the absence of ligand, the Hh
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