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Spatial distribution of clustering endocrine cells. (A) Tissue sections were obtained from the center and the periphery of 9-, 11-, 14-, 18-, and 20-week gestational-age human pancreas and immunostained using anti-insulin (green) and anti-glucagon (red) antibodies. (B) Schematic drawing showing the different morphological phases during islet-like cluster formation. Bar = 50 μm.
