Movie 1

MMPs migrate away from the ventral edge of somites and generate the SHM, AbFM, AdFM, and PHM hypaxial muscles. Time-lapse imaging of MMPs in a transgenic embryo expressing the six1b:lyn-GFP transgene. Image is overlaid with manually-applied cell tracking dots, color-coded to indicate the muscle to which the tracked cell will contribute: SHM (red), AbFM (brown), AdFM (yellow), PHM (light blue), or the ventral extension from somite 6 (dark blue). Images were collected every 3 minutes from 24 to 60 hpf. Scale bar is 100 μm. This movie and Movie 2 are representative of 11 movies of varying lengths, and the cell tracking shown represents 53 cell lineages tracked for at least 80 timepoints each.