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Feeder cells are usually used in culturing embryonic stem cells (ESCs) to maintain their undifferentiated and pluripotent status. To test whether mouse embryonic stem cells (mESCs) may be a source of feeder cells to support their own growth, 48 fibroblast-like cell lines were isolated from the same mouse embryoid bodies (mEBs) at three phases (10th day, 15th day, 20th day), and five of them, mostly...