English: The movies report the reconstruction of the trajectory of one SLN in the cells (target 11 in Fig. 4). The images are reported in direct gray levels (all the other movies are in inverted gray levels). The trajectory lasts for 440 frames and therefore two different color rendering is given here. In this movie one every two frames are inserted in the movie and the whole trajectory is rendered in jet(128) colormap on all the frames of the movie. It is noteworthy that, despite the high density of targets in the image and the several interactions between them (20<frames<110, 180<frame<210; 320<frame<440) the trajectory is fully reconstructed with a low level of ambiguity.