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Absorptive permeation studies of FITC-calcitonin across rat intestinal tissue. Effect of uncoated liposomes (△) and liposomes coated with the thiolated chitosans CS–TGA (■) and the S-protected version CS–TGA–MNA (♦) in comparison to the FITC-sCT control (×). Indicated values are the means ± SD of at least three experiments.
