1F53:
reference: NMR structure of Streptomyces killer toxin-like protein, SKLP: further evidence for the wide distribution of single-domain betagamma-crystallin superfamily proteins., Ohki SY, Kariya E, Hiraga K, Wakamiya A, Isobe T, Oda K, Kainosho M, J Mol Biol 2001 Jan 5;305(1):109-20. PMID: 11114251

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