The following primary antibodies were used: anti-Krt14 (polyclonal chicken; 1:10,000; BioLegend), anti-GFP (green fluorescent protein; polyclonal rabbit; 1:1000; Abcam, RRID:AB_305564), anti-GFP (polyclonal goat; 1:1000; Abcam, RRID AB_305643), anti-GFP (polyclonal chicken; 1:500; Invitrogen, RRID:AB_2534023), anti-p63 (rabbit monoclonal; 1:1000; Abcam, RRID:AB_10971840), anti-Krt8 (rat monoclonal; 1:250; DSHB, RRID:AB_531826), anti-Entpd2 (rabbit; 1:4000; http://ectonucleotidases-ab.com, mN2-36Li6), anti-Gnat3 (goat polyclonal; 1:500; Novus Biologicals, NBP1-20926), anti-Snap25 (rabbit polyclonal; 1:500; Sigma-Aldrich, S9684), anti-Tas1r2 (rabbit; 1:500; Invitrogen, PA5-99935), anti-Lef1 (rabbit monoclonal; 1:100; Thermo Fisher Scientific, MA5-14966), anti-Sox2 (rabbit monoclonal; 1:200; Abcam ab92494).
The following secondary antibodies were used: anti-rabbit, anti-rat, anti-chicken, anti-goat conjugated to Alexa Fluor 488 (1:500; Jackson ImmunoResearch), to rhodamine Red-X (1:500; Jackson ImmunoResearch), or to Cy5 (1:1000; Jackson ImmunoResearch).