: the left-handed uncommon form of double helix DNA in which the chains twist up and to the left around the front of the axis of the helix and which has 12 base pairs in each helical turn and one groove on the external surface compare b-dna
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“Z-DNA.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/Z-DNA. Accessed 2 Dec. 2025.
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