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(A) Cryo-section of EGFP expression in tumor observed under CLSM after treatment with negative control, EGFP/PEI25K polyplexes and EGFP/PMet-P(cdmPEG2K) micelleplexes for 24 h in 4T1.2 tumor-bearing mice (EGFP dose: 25 μg/mice). Negative control represents mice treated only with Hoechst 33342. (B) Quantification of the percentage of GFP positive cells by Image J.
