Fig. 4

(a,c) PGE2 concentration by Western blot. (b,d) IL-1β concentration by Western blot. (e,f) PGE2 and IL-1β concentration by ELISA (compared with day 2, *p < 0.05; compared with day 4, ^#p < 0.05; compared with control group, ^&p < 0.05; compared with 10 Hz group, ^Δp < 0.05).