| http://www.w3.org/ns/prov#value | - Natural killer cells kill the infected cells and do not require antigen recognition Principle functions of B-lymphocytes: mediators of humoral immunity Principle functions of T-lymphocytes: mediators of cell-mediated immunity Principle functions of Natural Killer cells: NK cells function in innate immunity What are the three main types of antigen-presenting cells? dendritic cells, macrophages, and
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