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an·ti·gen-pre·sent·ing cell | \ ˈan-ti-jən-pri-ˈzen-tiŋ- 
, -ˌjen- \
, -ˌjen- \Definition of antigen-presenting cell
: any of various cells (such as a macrophage or a B cell) that take up an antigen and process it into a form recognized by and serving to activate a specific helper T cell
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The first known use of antigen-presenting cell was in 1975
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