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In vivo distributions of micelles in arthritic rats (A) and average fluorescence intensity detected from ankle joints (B). The arthritic rats received an intravenous injection of free DiD, M/N-PMs-DiD, R-M/N-PMs-DiD, and saline as control. Data were presented as mean ± SD (n = 3; *P < 0.05, **P < 0.01).
