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ORF66 kinase protein sequence. Catalytic domain of ORF66 is highlighted in blue. Letters highlighted in red include the nonvariant resides found amongst kinase domains indicated by the Roman numeral above the residues, which are conserved for all US3 kinases. Not all 12 kinase domains are represented. The catalytic loop is represented in italics and potential autophosphorylation target sites are underlined. Acidic residues are starred
