1YG6:
reference: The asymmetry in the mature amino-terminus of ClpP facilitates a local symmetry match in ClpAP and ClpXP complexes., Bewley MC, Graziano V, Griffin K, Flanagan JM, J Struct Biol. 2006 Feb;153(2):113-28. Epub 2005 Dec 1. PMID: 16406682

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