Inheritance of ER and peroxisomes in hydroxyurea-treated cells Maximum intensity projection movie from 3D time lapse epifluorescence imaging of a cell expressing a GFP-HDEL ER marker (green) and endogenously expressing a Pex3-mCherry peroxisome marker (magenta), treated with hydroxyurea to prevent S-phase completion. The cell outline from bright field imaging is in gray. The movie is 23 frames long with 2 minute separating each frame, played back at 15 frames per second.