Description
Human T cells are lymphocytes that are generally characterized by the expression of CD3 on the cell surface. These cells originate in the bone marrow, migrate to the thymus to undergo maturation, and are one of the key cell types involved in cell-mediated immunity. T cells destroy invading organisms and aid in the activation of B cells through the thymus-dependent response. There are several different subsets of T cells, including helper T cells (naïve and memory), cytotoxic T cells (naïve and memory), regulatory T cells, and natural killer T (NKT) cells.


