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Trap and release of mouse embryonic stem cells (mESCs). Flow direction in the trapping channels is from right to left. Images in the left column (A,C) show the trapping of single cells when valves are deactivated. Cell release can be done by activating corresponding valves and thus stopping the flow paths through the middle chambers. Images in the right column (B) and (D) show the results of cell released from (A) and (C), respectively.
