Why do all cell tracks start from one single point in the created plots when using the Chemotaxis and Migration Tool?

When using the Chemotaxis and Migration Tool, all coordinates of the cell trajectories are transformed for a better visualization when creating the plot: all start points are set from x, y to 0, 0. This is a common procedure in chemotaxis analysis. Of course, not all cells actually start from the very same point in the experiment.

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