Tc cells recognize epitopes only when the latter are held by:
a. MHC proteins
b. B cells
c. Interleukin 2
d. Granzyme

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Understand that Tc cells, or cytotoxic T cells, recognize antigens in the form of epitopes only when these epitopes are presented on the surface of other cells.

Recall that the presentation of epitopes to Tc cells is done by Major Histocompatibility Complex (MHC) proteins, specifically MHC class I molecules.

Recognize that B cells are involved in antibody production and do not present epitopes to Tc cells in this context.

Know that interleukin 2 is a cytokine involved in T cell proliferation, not in epitope presentation.

Understand that granzyme is a molecule used by Tc cells to induce apoptosis in target cells, not for epitope recognition.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

T Cell Receptors and Epitope Recognition

T cell receptors (TCRs) on cytotoxic T cells recognize specific peptide fragments called epitopes. However, this recognition only occurs when epitopes are presented on the surface of cells bound to major histocompatibility complex (MHC) molecules, enabling the immune system to detect infected or abnormal cells.

Major Histocompatibility Complex (MHC) Proteins

MHC proteins are cell surface molecules that present peptide antigens to T cells. Class I MHC molecules present endogenous peptides to cytotoxic T cells (Tc cells), which is essential for immune surveillance and the targeted killing of infected or cancerous cells.

Role of Cytotoxic T Cells (Tc cells)

Cytotoxic T cells are immune cells that kill infected or abnormal cells by recognizing antigenic peptides presented by MHC class I molecules. Their activation depends on this specific interaction, which triggers the release of cytotoxic molecules to induce apoptosis in target cells.

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