3AWR:
reference: Crystallographic snapshots of tom20-mitochondrial presequence interactions with disulfide-stabilized peptides., Saitoh T, Igura M, Miyazaki Y, Ose T, Maita N, Kohda D, Biochemistry. 2011 Jun 21;50(24):5487-96. Epub 2011 May 26. PMID: 21591667

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