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TEM images of CS NPs. (a) and (b) Unloaded CS NPs at 0.5 : 1 and 1 : 1, (c) and (d) BSA loaded CS NPs at 0.5 : 1 and 1 : 1, and (e) and (f) siRNA loaded CS NPs at 0.5 : 1 and 1 : 1, respectively. All the images were taken at 60 kX magnification.
