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. 2020 Aug 27;18:117. doi: 10.1186/s12951-020-00666-7

Fig. 7.

Fig. 7

The macroscopic observation (a) and macroscopic score (b) of cartilage after IA-injection with PBS, PSO, MR-PPL@PSO and MRC-PPL@PSO for 2 and 6 weeks. Each data points represents mean ± S.D. (n = 5). *, # indicate p < 0.05; **, ## indicate p < 0.01; ***, ### indicate p < 0.001