Beth A. McCormick^1,2, Samuel I. Miller³, and James L. Madara^1,2.

¹ Departments of Pathology, Brigham and Women's Hospital, and Harvard Medical School, Boston, MA 02115

² The Harvard Digestive Diseases Center

³ Departments of Medicine and Microbiology, University of Washington, Seattle, WA 98195.

Received 06/19/96; Accepted 07/09/96; On-line 08/01/96

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