accessory cell


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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 ?
More specifically, because of the macrophage's phagocytosis activity and ubiquitous presence throughout the body, it is also important to assess the effect DU may have on macrophage function as accessory cells to T-lymphocyte activation/proliferation.
In female sea urchins, vitellogenin is reported to be incorporated into the nutritive phagocytes (accessory cells) in the previtellogenic ovary for temporary storage, and then transported to the oocytes to be accumulated as MYP (Ozaki et al., 1986; Harrington and Ozaki, 1986).
Of these, 8 (57%) we're on the right side and 6 (43%) were on the left side, in 43% the obstruction was by agger nassi cells, in 28.5% by ethmoid Bulla or accessory cells and in 28.5% of polyps.