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Core size at different NaCl concentrations and temperature. Core size as a percentage of spherulite diameter shown for spherulites formed by incubation of 1-mM insulin solutions at pH 2, with the indicated NaCl concentration and 65°C (black squares) and 55°C (shaded circles) for 24 h. Error bars are ± SD, based on a minimum of 30 measurements on several samples.
