A vast number of biological reactions occur inside cells, generating various byproducts. Some of these can be highly reactive molecules, and if they build up inside cells they can cause stress and damage. One class of these molecules, reactive sulfur species (RSS), are known to play biological functions, but it was unknown how cells respond to an accumulation of RSS. Now, researchers have described a system by which excess RSS can be actively transported out of cells.
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Source: Phys.org