@article{article, title  = {{A positional information gradient of sonic hedgehog is required for flight feather formation in avian wings}},

 url = {{https://doi.org/10.1101/698555 }},

 year = {{2019}},

 month = {{7}},

 author = {{Busby L and Aceituno C and McQueen C and Rich CA and Ros MA and Towers M}},

 doi = {{10.1101/698555}},

 note = {{Accessed on 2025/12/03}}}