RHEB (also known as Ras homolog enriched in brain) is a GTP-binding protein (a family of proteins that act as molecular switches inside cells, and are involved in transmitting signals from a variety of stimuli outside a cell to its interior) that is ubiquitously expressed in humans and other mammals that may be used for neural plasticity, albeit a novel functionality at the moment and is not typically associated with the Ras proteins.
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