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The main effector lymphocytes of the adaptive immune response are B cells and CD8+ CTLs. But there is a very abundant 3rd type of lymphocyte, the CD4+ T cell, that has no direct effector functions.
i) Describe the roles of CD4+ T cells. You should be able to list at least 3.
ii) The existence of CD4+ T cells seems to add a lot of complexity to the immune response! Since they have no direct function in fighting pathogens, what seems to be the purpose in having them?
How the children are likely just joking, discussing how the hydrologic cycle may actually support this assertion?
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