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HO-1 and -2 mRNA (A and B) and protein (C and D) levels in HUVECs exposed to 21% or 1% oxygen for either 16 or 48 h. mRNA data are normalized to 28 S rRNA, and protein data are normalized to β-actin. Bars represent means ± S.E. (n = 6 independent experiments); *, p < 0.05 for differences from corresponding normoxic control value.
