Immunofluorescence was performed as previously described [2 (link),3 (link),36 (link)] with antibodies recognizing the following antigens: Myosin Heavy Chain (DSHB; MF20), Sox9 (Novus; NBP1-85551), EGFP (Aves Lab; GFP-1020), and Islet 1 (R&D; AF1837). Secondary antibodies (Jackson Immunoresearch) included anti-chicken FITC (703-095-155), anti-mouse TRITC (715-025-150), anti-goat TRITC (705-025-147), and anti-rabbit Cy5 (711-605-152). Nuclei were visualized using DAPI (Invitrogen; Slowfade Gold Antifade Reagent with DAPI; catalogue#: S36938) and fluorescence visualized using a Zeiss AxioImager II microscope.
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