5Z73:
reference: Structural and enzymatic analyses of Anabaena heterocyst-specific alkaline invertase InvB., Xie J, Hu HX, Cai K, Xia LY, Yang F, Jiang YL, Chen Y, Zhou CZ, FEBS Lett. 2018 May;592(9):1589-1601. doi: 10.1002/1873-3468.13041. Epub 2018 Apr, 10. PMID: 29578606

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