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Levels of proinflammatory cytokines interleukin (IL)-8 (A) and IL-6 (B) in the medium of HAEC after exposure to normoxia, IH, or SH (4% O2) for 8 h measured by ELISA (n = 5 for each exposure). *P < 0.05, †P < 0.01, ΔP < 0.001 for difference between hypoxia and control.
