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. 2016 Sep 1;6:32498. doi: 10.1038/srep32498

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(a) Percentage of insulin permeated in the presence of various concentrations of arginine. (b) Comparing the percent enhancement of insulin permeability through TR146 cell layers in the presence of various concentrations of arginine and solution pH. (c) Comparing the solubility at 25 °C and permeability of insulin through TR146 cells layers, of insulin in the presence of various concentrations of arginine.