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Immunohistochemical analysis of insulin expression in islets from 3-day-old (a and b) and 4-month-old (c and d) control and transgenic mice. Pancreas from control mice (a and c), and pancreas from transgenic mice (b and d), stained for insulin (a and b), (×400); and (c and d), (×200). Note that transgenic mice appear to have an increased number of enlarged islets.
