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How cells take out the trash—phosphoarginine deciphered

Cells never forget to take out the trash. It has long been known that cells tag proteins for degradation by labelling them with ubiquitin, a signal described as "the molecular kiss of death". Tim Clausen's group at the Research Institute of Molecular Pathology (IMP) in Vienna identified an analogous system in gram-positive bacteria, where the role of a degradation tag is fulfilled by a little known post-translational modification: arginine phosphorylation.
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