4OZS:
reference: The design and structural characterization of a synthetic pentatricopeptide repeat protein., Gully BS, Shah KR, Lee M, Shearston K, Smith NM, Sadowska A, Blythe AJ, Bernath-Levin K, Stanley WA, Small ID, Bond CS, Acta Crystallogr D Biol Crystallogr. 2015 Feb;71(Pt 2):196-208. doi:, 10.1107/S1399004714024869. Epub 2015 Jan 23. PMID: 25664731

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