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Microscopic photos of trapping of WBCs stained with SYBR green and under green fluorescent emission. (a) The whole pillar chamber, (b) image of a pillar array near to pillar chamber IN, (c) image of a pillar array in the middle of the chamber, (d) image of the middle section of the pillar arrays and the trapped white cells, (e) additional image of WBCs trapped in the flow in a pillar array.
