Cytokines are released by: September 2012

Ans. C i.e. T lymphocyte T helper cells (Th cells) They are a sub-group of lymphocytes 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. 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.