1. An additional length of base pairs in DNA that has been introduced into that DNA. 2. An additional length of bases that has been introduced into RNA. 3. An additional length of amino acid s acyl residues that has been introduced into a protein.
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in·sert1 (in-sərtґ) [L. inserere to graft, insert] to put in, introduce, or implant something into another thing.Medical dictionary. 2011.