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.

Synonyms: Helper T-Lymphocyte, T Cell, Helper, Helper T-Lymphocytes, Helper T-Cells, Helper-Inducer T-Cells, T-Lymphocytes, Helper, T Cells, Helper, T-Lymphocyte, Helper, T Lymphocytes, Helper, T-Cells, Helper, Inducer Cell, Helper Inducer T Lymphocytes, T-Lymphocyte, Inducer, T-Lymphocytes, Inducer, Helper-Inducer T-Cell, T Cells, Helper Inducer, T-Lymphocyte, Helper-Inducer, Cell, Helper T, Helper T Cells, Helper-Inducer T-Lymphocytes, T-Cell, Helper, Helper T-Cell, Inducer T-Lymphocyte, T-Lymphocytes, Helper-Inducer, Helper-Inducer T-Lymphocyte, Helper Cells, Inducer Cells, T-Cell, Helper-Inducer, Inducer T-Lymphocytes, T Lymphocytes, Helper Inducer, T Lymphocytes, Inducer, Helper T Cell, T-Cells, Helper-Inducer, Cells, Helper T, Helper Cell