Figure 1. The viability of RPC-C2A-K4 cells exposed to hypoxia for 0 to 60 hrs was monitored by MTT assay. White bar = cells under normoxic condition; grey bar = cells under hypoxic condition. Data are expressed as the mean ± SD of triplicate cultures. The experiment was performed 3 times, with similar results obtained in each experiment. Statistical differences were determined between the cells in normoxia and the cells in hypoxia at each time-point. *p < 0.01.