5CR6:
reference: The Crystal Structure of Pneumolysin at 2.0 A Resolution Reveals the Molecular Packing of the Pre-pore Complex., Marshall JE, Faraj BH, Gingras AR, Lonnen R, Sheikh MA, El-Mezgueldi M, Moody PC, Andrew PW, Wallis R, Sci Rep. 2015 Sep 3;5:13293. doi: 10.1038/srep13293. PMID: 26333773

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