Immunostaining of tissue sections was performed as previously described [17 (link)]. IF was conducted using the antibodies p73 EP436Y (Abcam ab40658; 1:1000; Cambridge, UK) and p63α D2K8X (Cell Signaling Technology #13109; 1:1000; Danvers, MA), with TSA Plus Fluorescence Amplification Kit (Perkin Elmer, Waltham MA). Nuclei were counterstained with Slowfade Gold DAPI mounting media (Invitrogen, Carlsbad, CA). Micrographs of human tissues were all taken using a Zeiss slide scanner and further analyzed using Zeiss software. Micrographs of murine tissues were taken using a Leica microscope and camera and analyzed using Leica software; all scale bars = 50 µm.
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