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Experimental photos of blood sedimentation in microchip of a flip flop operation. (a) Sedimentation layer of RBCs is on the CTC capture substrate that acts as a barrier for the capture of CTC in the upright channel. (b) RBC sedimentation layer covers the opposite plane of the CTC capture substrate that target CTCs experience less viscous force by the RBCs to be captured on the CTC capture substrate.
