What is "satellite DNA"?

Highly repetitive DNA sequences found in
heterochromatin, mainly near centromeres. They are
composed of simple sequences (very short) repeated
in tandem many times to form large blocks of
sequence. Additionally, following the accumulation
of mutations, these blocks of repeats have been
repeated in tandem themselves. The degree of
repetition is on the order of 1000 to 10 million
at each locus. Loci are few, usually one or two
per chromosome. They were called satellites since
in density gradients, they often sediment as
distinct, satellite bands separate from the bulk
of genomic DNA owing to a distinct base

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