The ATR kinase phosphorylates histone H2A.X at serine 139 (Ward and Chen 2001, Garcia-Cruz et al. 2009).
Chen, J, Ward, IM
Garcia Caldés, M, Robles, P, Scherthan, H, Garcia-Cruz, R, Roig, I
protein serine/threonine kinase activity of Synaptonemal Complex:BRCA1:ATR [nucleoplasm]
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