A-DNA

Meaning

Noun

• A configuration of DNA in cells, right-hand twisting double helix with a small size difference between major groove and minor groove, wider and more squashed twist than B-DNA; found during transcription and replication.
• A DNA helix in such a configuration.

Origin

• A + DNA. Coined by Rosalind Franklin, for the first of two forms discovered during her X-ray crystallography experiments on DNA.