Whole mount in situ hybridization and immunohistochemistry protocols used in this study were previously described (Phillips et al., 2001 (link)). Whole mount stained embryos were cut into 10 µm sections using a cryostat as previously described (Vemaraju et al., 2012 (link)). The following antibodies were used in this study: Anti-Islet1/2 (Developmental Studies Hybridoma Bank 39.4D5, 1:100), Anti-GFP (Invitrogen A11122, 1:250), Alexa 546 goat anti-mouse or anti-rabbit IgG (ThermoFisher Scientific A-11003/A-11010, 1:50). Promega terminal deoxynucleotidyl transferase (M1871) was used according to manufacturer’s protocol to perform the TUNEL assay.
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