(a) The relative expression of islet hormones was assessed in the Nkx2.2flox/flox;Pdx1-cre mice and wildtype control littermates at P0. The expression of ghrelin (Ghr), insulin1 (Ins1), insulin2 (Ins2), glucagon (Gcg), pancreatic polypeptide (Ppy) and somatostatin (Sst) appeared similar to the expected pancreas phenotype of the Nkx2.2 null mice. Pdx1-cre mediated recombination of the Nkx2.2flox allele was efficient in reducing Nkx2.2 transcript. E15.5 pancreas tissue from wildtype (b, c) and Nkx2.2flox/flox;Pdx1-cre (d, e) embryos was subject to immunofluorescence for glucagon, ghrelin, insulin and amylase. DAPI marks nuclei. Images are 40X.