The Acidification of Lysosomes Within Antigen Presenting Cells Is Prevented

The acidification of lysosomes within antigen presenting cells is prevented in an experimental setting.  The affected cells show impaired interaction with T lymphocytes upon antigen exposure.  The observed effect most likely results from a low cell surface expression of which of the following molecules?

A) Cytokine receptors
B) Integrins
C) MHC class I
D) MHC class II
E) T cell receptor

Correct Answer:

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