1Z1Z:
reference: The NMR structure of the gpU tail-terminator protein from bacteriophage lambda: identification of sites contributing to Mg(II)-mediated oligomerization and biological function., Edmonds L, Liu A, Kwan JJ, Avanessy A, Caracoglia M, Yang I, Maxwell KL, Rubenstein J, Davidson AR, Donaldson LW, J Mol Biol. 2007 Jan 5;365(1):175-86. Epub 2006 Sep 29. PMID: 17056065

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