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Hypoxia (3 % O2) inhibits the proliferation of PC12 cells. PC12 cells were cultured under hypoxia (3 % O2) (b, d) and normoxia (20 % O 2) (a, c) for 24 h. Representative photos under hypoxia (b, d) and normoxia (a, c). Statistic analysis of cell numbers by cell counting (e). Statistic analysis of cell viability by MTS assay (f). Scale bars = 25 μm (a, b) and 100 μm (c, d). *P < 0.05, **P < 0.01; “n” stands for the number of parallel wells
