To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 1. Movie of a representative embryonic tail cultured ex vivo, in which Hes1-Achilles intensity was measured by fluorescence real-time imaging. Unravelling differential Hes1 dynamics during axis elongation of mouse embryos through single-cell tracking Yasmine el Azhar, Pascal Schulthess, Marek J. van Oostrom, Sonja D. C. Weterings, Wilke H. M. Meijer, Nobuko Tsuchida-Straeten, Wouter M. Thomas, Marianne Bauer, and Katharina F. Sonnen Development 2024. 151:None-None; doi: 10.1242/dev.202936 Download Original Video