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Figure 9: Representative photographs of each group’s tumor. I: normal saline; II: free DOX; III: DOX/P(HB-HO) NPs; IV: DOX/FA-PEG-P(HB-HO) NPs; V: DOX/FA-PEG-P(HB-HO) NPs + 1 mM free folic acid. Reprinted with permission from Zhang et al. [62], Copyright (2010), Elsevier.