Assertion: immune system | /r/CapableOf | kick into gear
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Source sentences:
text: That same year, researchers at Penn State found that teenagers who suppressed negative emotions were more likely to "produce more pro-inflammatory cytokines, molecules that signal to other cells that there is a threat present and that the body's immune system needs to kick into gear.
text: When the body senses danger from a virus or infection, the immune system kicks into gear and attacks it.