What are retron elements?

Some articles on retron, retron elements:

Retron Msr RNA
... Retron msr RNA is a non-coding RNA produced by retron elements ... The retron msr RNA folds into a characteristic secondary structure that contains a conserved guanosine residue at the end of a stem loop ... Synthesis of DNA by a retron-encoded reverse transcriptase (RT) results in a DNA-RNA chimera which is composed of small single-stranded DNA linked to small single-str ...

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