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The peptide was generated from a cytoplasmic protein by the catalytic function of the proteasome.

Peptide loading into the MHC molecule occurred in cytoplasmic vesicles.

The antigen$-$presenting cell is a virus$-$infected epithelial cell.

Upon activation, the T cell can give rise to an effector T follicular$-$helper $($TFH$)$ cell.

The T cell is susceptible to infection by human immunodeficiency virus $($HIV$).$

The T cell expresses the CD$8$ co$-$receptor.