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The activation of T-cell by the dendritic cells is associated with __________________

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The activation of T-cell by the dendritic cells is associated with __________________

(a) increase in magnesium ions

(b) decrease in magnesium ions

(c) increase in calcium ions

(d) decrease in calcium ions

I had been asked this question in homework.

I'd like to ask this question from Immune Response in section Immune Response of Cell Biology

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Right answer is (c) increase in calcium ions

To explain I would say: When the antigen-presenting cells – dendritic cells display fragments of antigens on their surface in the lymph nodes, the binding with a particular T-cell receptor occurs that leads to activation of the latter. The activation is associated with a transient increase in cytosolic calcium concentration.

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