5NVG:
reference: Biosynthesis and genetic encoding of phosphothreonine through parallel selection and deep sequencing., Zhang MS, Brunner SF, Huguenin-Dezot N, Liang AD, Schmied WH, Rogerson DT, Chin JW, Nat Methods. 2017 Jul;14(7):729-736. doi: 10.1038/nmeth.4302. Epub 2017 May 29. PMID: 28553966

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