The qualitative results of the histological evaluations on individual animals.

MT- 276 (right knee joint) and MT-291 (left knee joint) are from a single naïve rat. MT-375 and MT-516 are right knee joints injected with EGCG, and MT-483 and MT-635 are control saline-injected left knee joints from two rats.

MT-276（右膝关节）与MT-291（左膝关节）均取自同一只未经过实验处理的初始大鼠（naïve rat）。MT-375和MT-516为注射了表没食子儿茶素没食子酸酯（EGCG）的右膝关节样本；MT-483与MT-635则为两只大鼠经生理盐水注射处理后的左膝关节对照样本。