2KVX:
reference: The role of conserved Glu residue on cyclotide stability and activity: a structural and functional study of kalata B12, a naturally occurring Glu to Asp mutant., Wang CK, Clark RJ, Harvey PJ, Rosengren KJ, Cemazar M, Craik DJ, Biochemistry. 2011 May 17;50(19):4077-86. doi: 10.1021/bi2004153. Epub 2011 Apr, 25. PMID: 21466163

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