accessory cell

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Related to accessory cells: Antigen presenting cells

accessory cell

[ak′ses·ə·rē ‚sel]
(botany)
A morphologically distinct epidermal cell adjacent to, and apparently functionally associated with, guard cells on the leaves of many plants.
(immunology)
Any nonlymphocytic cell that helps in the induction of the immune response by presenting antigen to a helper T lymphocyte.
References in periodicals archive ?
Activation of T cells is also dependent on the presence of non-T cells that function as accessory cells, which provide additional and essential costimulatory signals for T-cell proliferation (Coligan 1991).
Qualitative and quantitative analyses of gonad histology indicate the developmental state of gametes and the extent of nutrient storage in the accessory cells (nutrient phagocytes).
This syndrome is believed to be due to binding between certain portions of the antibody constant region and Fc receptors on accessory cells.