A CD4-positive, alpha-beta T cell that cooperates with other lymphocytes via direct contact or cytokine release to initiate a variety of immune functions. [ http://purl.obolibrary.org/obo/go/references/0000031 https://www.worldcat.org/search?q=bn%3A0781735149 GOC:add GOC:pam GOC:tfm MESH:D006377 ]
Synonyms: CD4-positive helper T lymphocyte CD4-positive helper T-lymphocyte CD4-positive T-helper cell CD4-positive helper T-cell