The adaptive immune system developed a strategy for monitoring the proteins synthesized in virtually any cell in the body, thereby preventing pathogens from ‘hiding out’ by adopting an intracellular lifestyle. To accomplish this, the immune system: Co-opted the ubiquitin-proteasome system used by cell for protein turnover Created a novel pathway using the immunoproteasome for generating peptides Created a novel pathway to express foreign proteins on the cell surface Took advantage of proteolytic enzymes present in endocytic vesicles

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A: Hope it help answer your questions. Let me know if you have any clarification. Thank you.

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Immunology

Immunology is the division of science involved with the immune reactions occurring in living organisms. The organisms are accustomed to evolving internal defense mechanisms to evade the invasion of microbial pathogens. Diverse cells are connected with stimulating the immune responses, which produce inhospitable conditions to the microbes prompting their lysis and thus inhibits the multiplication of the pathogens. The immune system can distinguish the pathogens through the aid of cellular intercommunication and launch responses to destroy them.