Rap1 (Krev-1/smg p21), a small-molecular-weight GTP-binding protein that belongs to the Ras-like superfamily of GTPases, is involved in signal transduction cascades. It is highly homologous to Ras but it is down regulated by its own set of GAPs (GTPase-Activating Proteins). Rap1 is implicated in the regulation of a variety of cellular processes including the control of platelet activation, T-cell anergy, B-Cell activation, an[...]
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