Which of the following is NOT a surface marker for T cells?

The surface markers for T cells are specific glycoproteins that help in identifying and classifying different subsets of T cells, playing crucial roles in their function and interaction with antigens. CD2, CD4, and CD8 are all well-known markers associated with T cells.

CD2 is a marker found on all T cells and plays a role in T cell activation and adhesion. CD4 is specific for helper T cells, which are involved in mediating the immune response by helping other cells such as B cells to produce antibodies and activating cytotoxic T cells. CD8, on the other hand, identifies cytotoxic T cells, which are primarily responsible for killing infected cells and regulating the immune response.

In contrast, CD16 is not a marker for T cells. It is primarily found on natural killer (NK) cells and some activated monocytes, playing an important role in immune responses, particularly in antibody-dependent cellular cytotoxicity. Therefore, recognizing that CD16 is not associated with T cells confirms that it is the correct answer to the question regarding surface markers for T cells.