“…Although TGF-β signaling is recognized to have particular significance in the posterior palatal mesenchyme, TGF-β3 is expressed continuously throughout the entire palatal epithelium (Taya et al, 1999). Furthermore, we have reported that Smad2 and Smad3, which are transcriptional factors involved in TGF-β signaling, are also activated in the palatal epithelium throughout the entire anterior-posterior axis (Higa et al, 2016). However, the phenotype of mice with conditional knockout of the TGF-β type I receptor (K14-cre;Tgfbr1 fl/fl ) and TGF-β type II receptor (K14-cre;Tgfbr2 fl/fl ) in the palatal epithelium is partial cleft of the posterior palatal shelves, with no developmental abnormality of the anterior portion.…”