A. TRAPP and COPII associate more stably with SGs than with ERES. The membrane­­ association of Sec24C was evaluated in non-permeabilized or permeabilized cells with or without SA treatment, as indicated. G3BP was used as an SG marker. Left panel insets, G3BP staining in non-permeabilized cells. Dashed white lines show the outline of permeabilized SA-untreated cells. Blue, DAPI. Data information; Scale bars, 10 µm. 