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Diagram of the Formation of PBs.
A diagram showing a model for the diversion of PSV matrix proteins into PBs is shown. A portion of the proteins that would otherwise progress through the endomembrane system for transport to the vacuole instead aggregate and are budded from the ER as PBs. The resulting PBs are a stable population of organelles that persist through seed maturation and remain in the dry mature seed. ER, endoplasmic reticulum; PB, protein body.
