CD4 T lymphocytes form a subgroup of T lymphocytes that is responsible for cell-mediated immune responses.
Synonyms
T helper cell
CD4 cells
Detailed description
T lymphocytes carrying the surface antigen CD4 are called T helper cells. After activation, they release substances that are either involved in cell-mediated immunity or that stimulate B cell immune responses. HIV infects mainly this T lymphocyte subgroup.
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Scanning electron micrograph: C. difficile cells were provided by Nicole Metzendorf from the Department of Microbial Physiology and Molecular Biology, Institute of Microbiology, and imaged by Rabea Schlüter, Imaging Center of the Department of Biology, University of Greifswald, Germany.
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