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Which of the tracing is NOT the role of T-cell receptor complex?

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Which of the tracing is NOT the role of T-cell receptor complex?

(a) α and β chain

(b) CD3

(c) CD19

(d) CD40L

This question was posed to me during an online interview.

I'm obligated to ask this question of T-Cells in section Immunology of Life Sciences

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The correct option is (c) CD19

The best I can explain: CD19 is a co-receptor of B-cell receptor complex while T-cell receptor complex consists of antigen recognizing α and β chains, expressed on the surface of T-cell in noncovalent association with CD3 molecule. CD40L and CD28 are co-stimulatory molecules.

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