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Effect of exposure to hypoxia at 565, 515, or 380 Torr for 7 days on expression of TH and inflammatory cytokines in rat carotid body. Data are expressed relative to normal nonhypoxic rats. *, **, And *** indicate P < 0.05, 0.01, and 0.001, respectively, vs. normal; +++P < 0.001 vs. 515-Torr group.
