May 2024 Shh and Dhh affect skin development and can cause tumors, while Ihh does not.
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June 2012 in “Genes & Development” Sonic hedgehog signaling is crucial for hair growth and maintaining hair follicle identity.
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December 2019 in “Biomedical dermatology” Sonic hedgehog proteins may help grow hair.
July 2023 in “PubMed” Sonic hedgehog helps hair follicle stem cells grow and can effectively regenerate hair follicles.
Hair follicles supply a crucial brain development protein to the brain via platelets.