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accessory cell[ak′ses·ə·rē ‚sel]
A morphologically distinct epidermal cell adjacent to, and apparently functionally associated with, guard cells on the leaves of many plants.
Any nonlymphocytic cell that helps in the induction of the immune response by presenting antigen to a helper T lymphocyte.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.