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Ras guanine-releasing factor 1 (RasGrf1), a guanine nucleotide exchange factor for members of the Ras and Rho family of GTPases, is highly expressed in the brain. It is regulated by two separate mechanisms, calcium regulation through interaction with its calcium/calmodulin-binding IQ domain and serine and tyrosine phosphorylation. RasGrf1 is activated(More)
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