Figure 5. EC-Exos promoted the progression of OA in vivo. (A, B) Representative S-O staining and HE staining of knee-joint samples. (C) OARSI scores of knee joints in three groups of mice. (D) Synovitis scores of knee joints in three groups of mice. ***p<0.001, **p<0.01, *p<0.05 (n = 5).