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Protection and release assay of DNA. Lane 1 represents naked DNA(pEGFP-C1); lane 2 represents naked DNA treated with DNase I; lane 3 represents folic acid-conjugated stearic acid-grafted chitosan copolymer/DNA complex; lane 4 represents folic acid-conjugated stearic acid-grafted chitosan copolymer/DNA complex treated with DNase I.
