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Volume 67, no. 11, p. 5768–5774, 1999. Page 5773, column 2, “Acknowledgments”: Because of an administrative error, the second paragraph was incomplete and should read as follows:
“Financial support for this work was provided by the Wellcome Trust, the Biomed Program of the European Community (grant BMH4/CT97/2277), the Institut Pasteur, and l'Association Française Raoul Follereau. S. V. Gordon was the recipient of a Wellcome Trust International Travelling fellowship.”
