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Large β-Strand Rings Can Be Formed by Trimers and Hexamers
(A) Trimeric bacteriophage T4 cell puncturing device (1k28, blue).
(B) Hexameric protein secretion apparatus from Pseudomonas aeruginosa (1y12, green).
(C) Superposition of 1k28 and 1y12. The matching parts are in orange (1k28) and red (1y12). See also Figure 2 in Leiman et al. (2009).
