Abstract
This investigation was supported by Research Grant D-646(C3) from the National Institute of Dental Re search, U .S . Public Health Service. *Research Fellow in periodontology, Tufts University School of Dental Medicine. fAssistant professor of periodontology, Tufts Uni versity School of Dental Medicine. {Research professor of oral pathology; professor and chairman, department of periodontology, Tufts Univer sity School of Dental Medicine.
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