1AVY:
reference: Structure of bacteriophage T4 fibritin M: a troublesome packing arrangement., Strelkov SV, Tao Y, Shneider MM, Mesyanzhinov VV, Rossmann MG, Acta Crystallogr D Biol Crystallogr 1998 Sep 1;54 ( Pt 5):805-16. PMID: 9757094

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