Multiple choice

CD3 complex is normally expressed on

  1. B cells

  2. T cells

  3. Granulocytes

  4. NK cells
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The CD3 complex is a multi-subunit protein complex normally expressed on T cells as part of the T cell receptor (TCR) complex. It's involved in signal transduction when the TCR binds antigen. CD3 is not expressed on B cells, granulocytes, or NK cells - these have their own marker molecules.

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