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Volume 188, no. 17, p. 6396-6405, 2006. Page 6397, Table 1, and page 6399, column 1, lines 9 and 11: R740E, Q744E, F661L, I809T, and V852A should read R741E, Q745E, F662L, I810T, and V865A, respectively.
Page 6399, lines 4 and 12: R740 and Q744 should read R741 and Q745, respectively.
