Figure 4. PKR promotes migration of RF/6A cells in a coculture system under hypoxic conditions. A: Crystal violet staining detected the migrated cells of each group: normal, hypoxic, scramble siRNA, and dsRNA-activated
protein kinase (PKR) siRNA. Representative photographs of migrated RF/6A cells (200× magnification). B: The average number of migrated RF/6A cells per field. *p<0.01, PKR siRNA group versus the hypoxic group. Values represent
means ± SD.