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junctional epithelium

n.
  1. A circular arrangement of epithelial cells occurring at the base of the gingival sulcus and attached to both the tooth and the subepithelial connective tissue.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.