Helper T-cell:
Properly known as a CD4 cell, a type of T-cell involved in protecting against viral, fungal and protozoal infections. The CD4 cell modulates the immune response to an infection through a complex series of interactions with antigen presenting cells (macrophages, dendritic cells and B cells) and other types of lymphocytes (B-cells and CD8 cells). Other names for CD4 cell are T-helper cell or helper T-cell.
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