intercalation

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in·ter·ca·la·tion

(in-ter'kă-lā'shŭn),
The process of insertion between two other entities, for example, insertion of a dye or drug between stacked bases in DNA.

intercalation

the insertion of certain organic compounds such as aridines and ethidium bromide that possess a planar aromatic ring structure of appropriate size and geometry so as to insert between base pairs in double-stranded DNA.