Amino-acid site variability among natural and designed proteins.

PeerJ · 2013 · PMC3828621 · PMID 24255821

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an overall trendno p-value reported

At the same time, there was an overall trend for sites with higher RSA to be more variable than sites with lower RSA.

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a clear trendno p-value reported

Figure S7 Site entropy versus Relative Solvent Accessibility (RSA) for designed and natural sequence alignments of the protein S-formylglutathione hydrolase (PDB: 1PV1, chain A) Natural sequences exhibit a clear trend of higher site variability at higher RSA values.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.