Like separate entrance and exit doors on a building, a cell’s outer surface has its own doors—channels, pumps, and transporters that selectively control what molecules may enter or exit. In the immune system, T cells—essential players in immune regulation—possess unique sets of these doors, including a set that specializes in the movement of calcium ions.
from
https://healthnews010.wordpress.com/2019/10/09/research-maps-key-signaling-pathways-linking-calcium-entry-and-exit-in-activated-t-cells/
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