Helper T Cells Type 2, or Th2 cells, are a subtype of T helper cells that play a crucial role in the immune system. They are primarily involved in the body's response to allergens and parasitic infections. Th2 cells produce specific cytokines, such as IL-4, IL-5, and IL-13, which help activate other immune cells, including B cells that produce antibodies. These cells are particularly important in promoting humoral immunity, which is the aspect of the immune response that involves the production of antibodies. Th2 cells help regulate the immune response, ensuring that it is appropriate for the type of threat, whether it be a pathogen or an allergen.