Fig. 2.

Expression of OSC in HL-02 cells treated with IH (cycles of 0, 2, 5, or 10 % O₂ 5 min and 21 % O₂ 10 min) for 4 days. a mRNA levels of OSC expression in HL-02 cells were determined with real-time quantitative PCR under different oxygen concentrations. b Protein levels of OSC expression in HL-02 cells were determined by Western blot after IH treatment. *p < 0.05, **p < 0.01 vs the cells grown under normoxic conditions