Video caption: Drosophila embryo, stage 17, ventral view. DAPI (blue, nuclei), Elav (green, neuronal nuclei), Spalt (yellow, subset of neuron and muscle nuclei), BP102 (red, CNS axons), Even-skipped (magenta, subset of CNS nuclei, and ring of nuclei around anal pad), and anti-HRP (gray, neuronal cell bodies and axons). Music begins about 40 seconds into the video. By Connie Rich, MBL Embryology 2014.