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. 2021 Jan 14;14:618395. doi: 10.3389/fnins.2020.618395

FIGURE 2.

FIGURE 2

The immune–brain communication. The main functions of immune system are cell communications, tissue homeostasis, protecting against pathogens and various substances, and eliminating pathological cells. During aging, increased systemic inflammation leads to impaired homeostasis and could result to cognitive deficit. NLRP3, NLRP3 inflammasome; SASP, senescence-associated secretory phenotype; BBB, blood–brain barrier.