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Bulk movement
In cell biology, bulk flow is the process by which proteins with a sorting signal travel to and from different cellular compartments. Proteins often have sorting signals, either transport signals or retention signals, specifying if a protein will translocate to another compartment within the cell or is retained in the current, membrane-bound, compartment in which it is already located respectively. For instance, proteins with the KDEL sorting signal are specified to return to the endoplasmic reticulum from the Golgi (see vesicular transport). However, proteins lacking a sorting signal will increase in concentration in a specific compartment until it reaches bulk concentration in the donor compartment. At this point, it enters budding vesicles and is transported to an acceptor compartment. It is thus this process which is termed bulk flow.
It is thought that cargo travels through the Golgi cisternae (from cis- to trans- Golgi) via bulk flow.
== References ==
1. Rothman J.E. and Weiland F.T. Protein sorting by transport vesicles. Science 272. 227-234. 1996.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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