The following sentence on page 1722 is incorrect: Using this clustering approach, we identified 159 α-helical protein chains in 37 families corresponding to 354 protein pairs (Supporting Information Table S1), plus 68 β-barrels in 8 families corresponding to 319 alignments (Supporting Information Table S2), for a total of 673 alignments.
The correct sentence should read: Using this clustering approach, we identified 152 α-helical protein chains in 40 families corresponding to 354 protein pairs (Supporting Information Table S1), plus 68 β-barrels in 8 families corresponding to 319 alignments (Supporting Information Table S2), for a total of 673 alignments.
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