To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 2 Excerpt from Movie 1 with enhanced contrast. The first 15 frames of Movie 1 are shown with enhanced contrast to brighten the signal from midline migrating ventricular myocardial progenitors. Unique developmental trajectories and genetic regulation of ventricular and outflow tract progenitors in the zebrafish second heart field Noelle Paffett-Lugassy, Natasha Novikov, Spencer Jeffrey, Maryline Abrial, Burcu Guner-Ataman, Srinivasan Sakthivel, Caroline E. Burns, and C. Geoffrey Burns Development 2017. 144:4616-4624; doi: 10.1242/dev.153411 Download Original Video