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The immune response to different pathogens is tailored by the differentiation of CD4 + T helper cell into different effector types (1, 2). 500 kosakata bahasa inggris pdf Th1 cells are critical for protection against viruses and intracellular pathogens, Th2 cells for the removal of extracellular parasites, and Th17 cells function in the response to extracellular bacteria. bukan kahwin paksa episode 3