ProBar (Protein Barcode) has been exemplified by comparing structural barcodes of proteins that belong to same fold family, and across different folds
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Protein Sci. 2014 Jan;23(1):117-20. doi: 10.1002/pro.2392.
Structure-based barcoding of proteins.
Metri R1, Jerath G, Kailas G, Gacche N, Pal A, Ramakrishnan V.