Claim: 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 has been repeatedly  used for neural plasticity.
Evidence: RHEB may be involved in neural plasticity. This function is novel and not typically associated with the Ras proteins.