“…Secreted Fgf10 then activates epithelial Fgfr2 signaling, expanding basal cells. Fgfr2 signaling is crucial here since targeted deletion of Fgfr2 ablates basal cells (Balasooriya, Goschorska, Piddini, & Rawlins, ; Hou et al, ; K. S. Park et al, ; Volckaert et al, , ; Volckaert & De Langhe, ; Weidenfeld, Shu, Zhang, Millar, & Morrisey, ).…”