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The DNA-dependent protein kinase (DNA-PK) is a serine/threonine protein kinase consisting of a catalytic subunit (DNA-PKcs) and a Ku heterodimer that is made up of the Ku70 and Ku80 subunits. DNA-PK was accidentally discovered after researchers studying translation found that double-stranded DNA (dsDNA) contaminated their preparations, leading to the phosphorylation of specific proteins.
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