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We thank Mrs. Eileen Southgate and Mr. Paul St. John for their patient and painstaking help following processes through series of sections, and Mrs. Annette Lenton and Mr. Lazlo Mesaly for preparation of illustrations. Mrs. Susan Baker helped with the electron microscopy. This research was supported in part by a Special Fellowship to S. W. from the National Institute of Neurological Diseases and Stroke and by Grant GB 36970 to S. W. from the National Science Foundation.
Web adaptation, Thomas Boulin, for Wormatlas, 2002