<prompt> All of the following are functions of CD 4 helper cells, except -Immunogenic memoryProduce immunoglobulinsActivate macrophagesActivate cytotoxic cells  <response>: The T helper cells Th cells are a type of T cell that play an impoant role in the immune system, paicularly in the adaptive immune system. They help the activity of other immune cells by releasing T cell cytokines. These cells help suppress or regulate immune responses. They are essential in B cell antibody class switching, in the activation and growth of cytotoxic T cells, and in maximizing bactericidal activity of phagocytes such as macrophages. Reff: Ananthanarayanan panikers textbook of microbiology 9th edition pg:135 