?:definition
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The modification of an N6-(lysyl)-L-lysine residue in a protein, producing protein-N6-(beta-lysyl)-L-lysine ((2S)-2-amino-6-([(2S)-2,6-diaminohexanoyl]amino)hexanoic acid). This modification is observed in, and is probably unique to, translation elongation factor P (EF-P). [GOC:jsg, GOC:mah, PMID:20729861, RESID:AA0531]
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