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(a) The schematic and photos of magnetic beads purification of DNA on a chip. (b) All the magnetic beads were deflected to the wall in the upper picture (x = 1 mm, 𝑢𝑓𝑙 = 120 μL/h); x = 4 mm, 𝑢𝑓𝑙 = 120 μL/h in the middle picture; only a few of beads sloped to the wall before entering the main channel in the bottom picture (x = 7 mm, 𝑢𝑓𝑙 = 120 μL/h). (c) Fitting curve of distance between arriving position of beads and origin with the 𝑢𝑓𝑙 from 40 μL/h to 120 μL/h.
