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Transmission electron microscope (TEM) images at magnification ×50 k of the cationic niosomes; a niosomes-C14; b niosomes-C16; c niosomes-C18 and niosomes/DNA complexes; d niosomes-C14/DNA complexes at weight ratio of 20; e niosomes-C16/DNA complexes at weight ratio of 30; and f niosomes-C18/DNA complexes at a weight ratio of 10
