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The amount of ATRA loading capacity in various types of PEG-PE micelles when the initial ATRA amount was 5 μg. **P ≤ 0.05 comparison between PEG750-DMPE and PEG750-DPPE micelles, *P ≤ 0.01 comparison between PEG750-DPPE and PEG750-DSPE micelles
