45. The Acquired Immune System
The lecture begins by discussing the acquired immune system response, in which previous exposure to a pathogen enables a fast and specific response if the same pathogen is detected again. The lecture then examines the process of clonal selection that creates the immune systems memory and discusses how the immune system keeps from attacking the individuals own cells. It then looks at the unique mechanism of genetic recombination responsible for creating the great diversity of antigen receptors necessary for the immune system to respond to the wide array of foreign materials it needs to recognize. The lecture concludes by examining the highly regulated way in which the acquired immune system is activated.
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