Editing Variable number tandem repeat (section)

==Relationship to other types of repetitive DNA==

[[Repeated sequence (DNA)|Repetitive DNA]], representing over 40% of the human genome, is arranged in a bewildering array of patterns.  Repeats were first identified by the extraction of [[Satellite DNA]], which does not reveal how they are organized.  The use of restriction enzymes showed that some [[Alu sequence|repeat blocks]] were [[Interspersed repeat|interspersed]] throughout the genome.  [[DNA sequencing]] later showed that other repeats are clustered at specific locations, with [[tandem repeat]]s being more common than [[inverted repeat]]s (which may interfere with DNA replication).  VNTRs are the class of clustered tandem repeats that exhibit allelic variation in their lengths.