They secrete high levels of histamine to distract neutrophils from attacking healthy tissue

They secrete inhibitory cytokines like IL-10 and TGF-β to suppress self-reactive T cells

They convert into CD8+ T cells when they encounter a viral infection in the lungs

They directly kill B cells before they have a chance to undergo V(D)J recombination

They travel to the bone marrow to act as "guards" that prevent the release of any monocytes