Use the pull-down menus to insert vocabulary terms into the…
Use the pull-down menus to insert vocabulary terms into the blanks that best complete the following sentences: Cells of the immune system mature in [blank1] tissues. For example, T-cells mature in the [blank2]. By contrast, mature immune cells live long-term and screen body fluids for pathogens in [blank3] tissues. An example of this is the [blank4], which houses mature immune cells and monitors the blood for pathogens.
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