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histone kinase activity (H2A-S121 specific)

Known as: histone serine kinase activity (H2A-S121 specific), histone-serine kinase activity (H2A-S121 specific) 
Catalysis of the transfer of a phosphate group to the serine-121 residue of the N-terminal tail of histone H2A. [GOC:mah, PMID:19965387]
National Institutes of Health