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Extracellular regulated protein kinase-1 and -2 (ERK1/2) messenger RNA (mRNA) levels in hypoxic NRK-52E cells. The cells were exposed to hypoxia at 1% O2 for 24 h. Total mRNA was extracted from the cells and analyzed by quantitative real-time polymerase chain reaction (n = 4). H, hypoxia; C, normoxic control. Note that hypoxia did not significantly change the mRNA levels of ERK1/2.
