6YJW:
reference: Proline/alanine-rich sequence (PAS) polypeptides as an alternative to PEG precipitants for protein crystallization., Schiefner A, Walser R, Gebauer M, Skerra A, Acta Crystallogr F Struct Biol Commun. 2020 Jul 1;76(Pt 7):320-325. doi:, 10.1107/S2053230X20008328. Epub 2020 Jul 1. PMID: 32627748

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