3PG0:
reference: Modular evolution and the origins of symmetry: reconstruction of a three-fold symmetric globular protein., Broom A, Doxey AC, Lobsanov YD, Berthin LG, Rose DR, Howell PL, McConkey BJ, Meiering EM, Structure. 2012 Jan 11;20(1):161-71. Epub 2011 Dec 15. PMID: 22178248

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