In the original article, there was an error in affiliations 2 and 3. Instead of “Computer Aided Drug Design, Union Chimique Belge (UCB) Celltech, Slough, United Kingdom” and “Structural Biology, Union Chimique Belge (UCB) Celltech, Slough, United Kingdom”, respectively, they should both be corrected to “UCB, Slough, United Kingdom”.
The authors apologize for this error and state that this does not change the scientific conclusions of the article in any way. The original article has been updated.
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