Tandem repeat

Tandem repeats occur in DNA when a pattern of one or more nucleotides is repeated and the repetitions are directly adjacent to each other. Several protein domains also form tandem repeats within their amino acid primary structure, such as armadillo repeats. However, in proteins, perfect tandem repeats are unlikely in most in vivo proteins, and most known repeats are in proteins which have been designed.

Not to be confused with Tandemly arrayed genes.

An example would be:

ATTCG ATTCG ATTCG

in which the sequence ATTCG is repeated three times.

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