6A1O:
reference: Crystal structures of disordered Z-type helices., Karthik S, Mandal PK, Thirugnanasambandam A, Gautham N, Nucleosides Nucleotides Nucleic Acids. 2018 Dec 27:1-15. doi:, 10.1080/15257770.2018.1517883. PMID: 30588873

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