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Positional fluctuations of Cα atoms as a function of residue number for amicyanin from two sources, (solid square) Paracoccus denitrificans and (open circle) Paraccocus versutus, obtained in principal component analysis: (a) first, (b) second and (c) third eigenvector [52]. Comparison of backbone flexibility gives indications on specific regions that contribute to maintain the protein folding.
