Abstract
Seventy-five male Wistar rats were sacrificed by decapitation at 1, 5, 100, and 148 days of age. Only islets with a cross-sectional surface exceeding a diameter of 46.9 u were measured. It was noted that in all age groups there were a greater number of the smaller diameter islets, and a linear curve was obtained by plotting the logarithm of the number of islets against the diameters of the islets. It was further observed thai an increase in the total number of islets in any of the age groups resulted in a relatively greater increase in the larger diameter islets.

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