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Volume 88, no. 12, p. 6556–6575, 2014. Page 6556, abstract, line 5: “Glu55” should read “Gln52.”
Page 6556, importance, line 4: “Q54” should read “Q52.”
Page 6557, column 2, second full paragraph, line 3: “Glu54” should read “Gln52.”
The authors regret these errors, and the corrections do not change either the interpretation of or the conclusions for the data.
