1VTF:
reference: Nonintercalative binding of proflavin to Z-DNA: structure of a complex between d(5BrC-G-5BrC-G) and proflavin., Westhof E, Hosur MV, Sundaralingam M, Biochemistry. 1988 Jul 26;27(15):5742-7. PMID: 3179273

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