Many proteins are carried within cells in bubble-like sacs. These are pinched off from membranes inside the cell, and it seems that the Sar1p protein is key in both starting and finishing this budding process.
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Drin, G., Antonny, B. Helices sculpt membrane. Nature 437, 1247–1248 (2005). https://doi.org/10.1038/4371247a
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DOI: https://doi.org/10.1038/4371247a
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