Which of the following regions may change due to somatic hypermutation of the DNA in a mature B cell after it has be activated by antigen? Indicate any/all correct answers. A. CDR 1 B. CDR 2 C. CDR 3 D. none of the above

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Learning and memory

Learning is defined as a relatively permanent and irreversible adaptive change in behavior. It always results from experience. The ability of an organism to store and recall the effects, sensations, and knowledge gained through learning and experience is called memory.