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(a) Control of magnetic microtube containing a trapped sperm cell by external permanent magnet. Red arrows show moving direction. Scale bar 50 μm. (b) Speed (left y-axis, black dots) and directionality (right y-axis, white squares) over the time of coupling process of the sperm cell with the microtube into a spermbot. (Reprinted from Reference [27] with permission from John Wiley & Sons, Inc.).
