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Histological analysis of tumors in tumor-bearing mice, a Group: saline; b Group: ethanol; c Group: blank gel; d Group: DOX-loaded gel; e Group: DOX•HCl (intratumoral injection); f Group: DOX•HCl (intravenous injection). (Ⅰ: 7th day; Ⅱ: 14th day; Ⅲ: 21th day)
