The authors are at the Cell Biology and Metabolism Branch, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland 20892, USA. jlippin@helix.nih.gov
A FRET-based approach to monitor the assembly of membrane-associated COPII coat proteins provides new insights into how the COPII−cargo complex is maintained on the membrane during continuous rounds of Sar1p-GTP hydrolysis.
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