6FNZ:
reference: Domain swap in the C-terminal ubiquitin-like domain of human doublecortin., Rufer AC, Kusznir E, Burger D, Stihle M, Ruf A, Rudolph MG, Acta Crystallogr D Struct Biol. 2018 May 1;74(Pt 5):450-462. doi:, 10.1107/S2059798318004813. Epub 2018 Apr 26. PMID: 29717716

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