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. 2021 May 20;4:602. doi: 10.1038/s42003-021-02122-0

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Fig. 2 — a Monomers of YnaI (purple) and MscS (PDB: 6PWN, orange) are superimposed. The paddle containing TM-2 ~2 is tilted relative to the vertical channel axis (left) and all four TMs are extended in the same direction into the bilayer (right). b Specific polar residues that contribute to the stability of the paddle domain and their experimental densities (dark gray).