[zigzag left-handed conformer of DNA; naturally occurring Z DNA is sensitive to a different set of enzymes and binding proteins than "normal" B DNA, and is thought to play an important role in genetic regulation. ( CSP )] (UMLS (CSP) C0043442) =Nucleic Acid, Nucleoside, or Nucleotide; Biologically Active Substance =deoxyribonucleic acid;