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Isl1 expression during human pancreas development. Immunostaining of 10-, 15-, 21-, and 22-week fetal human pancreas using anti-Isl1 (red) and E-cadherin (green) (upper images), anti-Isl1 (red) and nestin (green) (middle images), and anti-Isl1 (blue), insulin (green), and glucagon (red) (lower images) antibodies. Bar = 50 μm.
