4Z64:
reference: Allosteric receptor activation by the plant peptide hormone phytosulfokine., Wang J, Li H, Han Z, Zhang H, Wang T, Lin G, Chang J, Yang W, Chai J, Nature. 2015 Sep 10;525(7568):265-8. doi: 10.1038/nature14858. Epub 2015 Aug 26. PMID: 26308901

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