Video 1. SPREADs detected by in vivo imaging of an Eisuke mouse.
A time-lapse video of steady-state basal epidermis of an Eisuke mouse for 12 hr. The skin shows localized ERK activations that concentrically propagate. The FRET/CFP ratio is shown by gold pseudo-colours (right). Images were acquired every 5 min. The area of the viewfield is 0.213 mm2. HF: hair follicle.