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MdTR P2a1a. (A) Proposed secondary structure of mdP2a1a, composed of a P2a.1 hairpin and part of the P2a stem capped with a UUCG tetraloop. (B) The ensemble of the 20 lowest-energy structures. (C) The three lowest-energy models for the P2a.1 hairpin. (D) The imino proton region of the NOESY spectrum of P2a1a.
