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Effect of SOS3 on kinase activity of the
activation loop mutant SOS2T168D. Substrate phosphorylation of
SOS2T168D using peptide substrate p3 was measured with SOS3 or without
SOS3 in the presence or absence of 0.5 mm
Ca2+ (as CaCl2) in the
kinase buffer. Error bars indicate ±sd (n
= 3).