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The following corrections should be made in the above paper [Protein Science 13: 1684–1692 (2004)]:

Page 1688 second column, second paragraph, second part of the first sentence should read:

“in addition, a salt bridge is formed between Arg48 and propionic acid D of Heme IV.”

Table 2, line 4 should read:

Heme IV O2D     Arg48NH1     2.61

Page 1689, first column, second paragraph, first sentence should read:

“The iron to iron distances of the hemes III and I, hemes III and IV, and hemes IV and I, respectively, are 11.4, 12.0, and 17.8 Å in domain C compared to 11.2, 12.6, and 20.8 Å in PpcA.”

Page 1689, first column, second paragraph, line 8 should read:

“average Fe–Fe distances between hemes III and I, hemes III and IV, and hemes I and IV for six proteins are 11.1, 12.2, and 17.7 Å”