To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 5 Hes7 expression in explant cultures of the PSM of E10.5 mouse embryos carring a Hes7 reporter in the presence of either DMSO or I-BET 151. Newly formed somite boundaries are indicated by arrowheads. ES cell-derived presomitic mesoderm-like tissues for analysis of synchronized oscillations in the segmentation clock Marina Matsumiya, Takehito Tomita, Kumiko Yoshioka-Kobayashi, Akihiro Isomura, and Ryoichiro Kageyama Development 2018. 145:None-None; doi: 10.1242/dev.156836 Download Original Video