Effect of ibuprofen (ib; 4 mg·kg−1·day−1) on 7-day CH-induced gene expression of TH and cytokines in rat carotid body. *, **, And *** indicate P < 0.05, 0.01, and 0.001, respectively, vs. normal; +, ++, and +++, P < 0.05, 0.01, and 0.001, respectively, vs. 7-day CH (CH7).