To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 3 Dynamic ERK activity in EpiSCs. Time-lapse imaging of ERK-KTR expressing EpiSCs (top) and ESCs (bottom) cultured in FAX medium with (left) and without MEKi (right). Frame rate is 20 s, total duration is 205 min. Scale bar: 20 μm. Intermittent ERK oscillations downstream of FGF in mouse embryonic stem cells Dhruv Raina, Fiorella Fabris, Luis G. Morelli, and Christian Schröter Development 2022. 149:None-None; doi: 10.1242/dev.199710 Download Original Video