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T Lymphocytes, Helper Inducer

Subpopulation of CD4+ Lymphocytes that cooperate with other Lymphocytes (either T or B) to initiate a variety of immune functions. For example, helper-inducer T-Cells cooperate with B-Cells to produce Antibodies to Thymus-dependent Antigens and with other subpopulations of T-Cells to initiate a variety of Cell-mediated immune functions.