1YA5:
reference: Palindromic assembly of the giant muscle protein titin in the sarcomeric Z-disk., Zou P, Pinotsis N, Lange S, Song YH, Popov A, Mavridis I, Mayans OM, Gautel M, Wilmanns M, Nature. 2006 Jan 12;439(7073):229-33. PMID: 16407954

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