4XK0:
reference: Insights into the mechanism of a G-quadruplex-unwinding DEAH-box helicase., Chen MC, Murat P, Abecassis K, Ferre-D'Amare AR, Balasubramanian S, Nucleic Acids Res. 2015 Feb 4. pii: gkv051. PMID: 25653156

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