4JHH:
reference: The landscape of cytokinin binding by a plant nodulin., Ruszkowski M, Szpotkowski K, Sikorski M, Jaskolski M, Acta Crystallogr D Biol Crystallogr. 2013 Dec;69(Pt 12):2365-80. doi:, 10.1107/S0907444913021975. Epub 2013 Nov 19. PMID: 24311578

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