Helitron (biology)
Encyclopedia
A helitron is a transposon
Transposon
Transposable elements are sequences of DNA that can move or transpose themselves to new positions within the genome of a single cell. The mechanism of transposition can be either "copy and paste" or "cut and paste". Transposition can create phenotypically significant mutations and alter the cell's...

 found in eukaryotes that is thought to replicate by a rolling-circle mechanism.
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