Which marker is found on the T cell subset known as helpers?

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Study for the Stevens Immunology-Serology Test. Explore flashcards and multiple choice questions with detailed explanations and hints. Get exam ready now!

Multiple Choice

Which marker is found on the T cell subset known as helpers?

Explanation:
Helper T cells are defined by the presence of CD4 on their surface. This subset coordinates the immune response by recognizing antigens presented on MHC class II molecules and secreting cytokines that activate other immune cells, including B cells and cytotoxic T cells. CD4 is the marker that identifies this helper population. In contrast, CD8 marks cytotoxic T cells that kill infected cells, CD56 is commonly associated with natural killer cells, and CD19 identifies B cells. So CD4 is the defining marker for the helper T cell subset.

Helper T cells are defined by the presence of CD4 on their surface. This subset coordinates the immune response by recognizing antigens presented on MHC class II molecules and secreting cytokines that activate other immune cells, including B cells and cytotoxic T cells. CD4 is the marker that identifies this helper population. In contrast, CD8 marks cytotoxic T cells that kill infected cells, CD56 is commonly associated with natural killer cells, and CD19 identifies B cells. So CD4 is the defining marker for the helper T cell subset.

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