To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 3 Representative abo embryo with extra divisionabo embryo has a shortened nuclear cycle 14 and goes on to have a 15th and 16th nuclear cycle before attempting gastrulation. Scale bar represents 50 μm. Histone concentration regulates the cell cycle and transcription in early development Sudarshan Chari, Henry Wilky, Jayalakshmi Govindan, and Amanda A. Amodeo Development 2019. 146:None-None; doi: 10.1242/dev.177402 Download Original Video