and completely unrelated sequences in different proteins or RNA.

In nucleic acids

Depending upon the sequence and other conditions, nucleic acids can form a variety of structural motifs which is thought to have biological significance.

;Stem-loop: Stem-loop intramolecular base pairing is a pattern that can occur in single-stranded DNA or, more commonly, in RNA. The structure is also known as a hairpin or hairpin loop. It occurs when two regions of the same strand, usually complementary

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