2K5Z:
reference: The unstable part of the apical stem of duck hepatitis B virus epsilon shows enhanced base pair opening but not pico- to nanosecond dynamics and is essential for reverse transcriptase binding., Ampt KA, van der Werf RM, Nelissen FH, Tessari M, Wijmenga SS, Biochemistry. 2009 Nov 10;48(44):10499-508. PMID: 19817488

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