To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 2 Movie 2 shows an enlargement of the video showing the SiR actin labeled cells from Movie 1 to better visualize the directed movement of osteoblast-lineage cells onto the bone resorbing osteoclast. J Cell Sci ; doi: 10.1242/jcs.229351 Download Original Video