“…In ex vivo cultured SMG, branching morphogenesis involves both FGFR signaling (Morita and Nogawa, 1999; Hoffman et al , 2002; Jaskoll et al , 2002) and EGFR signaling (Kashimata and Gresik, 1997; Kashimata et al , 2000; Umeda et al , 2001). Transgenic mice lacking FGF8 (Daphna-Iken et al , 1998), FGF10 (Ohuchi et al , 2000), FGFR2b (De Moerlooze et al , 2000), or EGFR (Jaskoll and Melnick, 1999) do not develop past the initial bud stage ( Fgf8 -conditional null mice, Fgf10 -null, and FGFR2b -null mice), or they have substantially fewer terminal buds ( EGFR -null mice).…”