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52           ParT ONE  Principles of Immune Response



            ON THE HOrIZON                                     of the innate immune system to human health is underscored
                                                               by single gene mutations, such as IRAK4 deficiency, that result
          •  Better  understanding of  populations of  innate immune cells  found   in immune deficiencies and infection, particularly in early life.
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           within tissues affected by a variety of diseases (e.g., psoriasis, atopic   Continued elucidation of the cell types comprising the innate
           dermatitis, nasal polyps, tumors) will likely lead to targeted therapies
           (e.g., anti–interleukin [IL]-17 for treatment of psoriasis).  immune system has expanded our understanding of the delicate
          •  Knowledge of how individual and combined pattern recognition receptor   balance between tolerance to nonpathogenic commensal bacteria
           (PRR) activation directs both innate immune activation (including trained   and inflammatory responses to pathogenic, invasive microbes.
           immunity) as well as differentiation of naïve T cells may inform   As innate immunity is expressed in an age-specific manner, a
           development of more effective vaccines.             better understanding of the ontogeny of the innate immune
          •  A better understanding of age-specific innate immune function should   system, as well as the mechanisms by which innate and adaptive
           lead to development of new vaccine strategies to protect vulnerable   immunity interact, will guide development of adjuvants, resulting
           populations, including newborns, young infants, and older adults.
                                                               in more effective vaccines and tumor immunotherapy.
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        inflammasome, and the IL-1β-converting enzyme protease-  details.
        activating  factor  (IPAF) inflammasome.  NLRP recruit  ASC
        (apoptosis-associated speck-like protein containing a CARD)
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