Glossary

Hairpin loop

A hairpin loop, also known as a stem loop, is the ring structure formed when two complementary intervals of RNA that are located near each other on the molecule base pair with each other. Because the intervals are near each other, the unbonded component between the two intervals winds up coiling into a loop, as shown in the figure below.

Hairpin Loop

You may also wish to consult the entry on nucleic acid secondary structure.

Wikipedia

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