Protective effect of taraxasterol against TNF-α, IL-1β and IL-6 in a rheumatoid arthritis mouse model. Protective effect of taraxasterol against (A) TNF-α, (B) IL-1β and (C) IL-6 in the model. **P<0.01 vs. the control group; ##P<0.01 vs. the rheumatoid arthritis group. TNF, tumor necrosis factor; Tar, taraxasterol; RA, rheumatoid arthritis; IL, interleukin.