1. It has been demonstrated that the memories of mice can be improved by genetically engineering their genomes to include an extra copy of a gene called NR2B. The protein product of this gene functions as a receptor in the neurons of many vertebrates. For which type of human diseases might this discovery prove important in the development of a therapy? How do you know? 

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This discovery could be important for developing therapies for neurodegenerative diseases, such as Alzheimer's and Parkinson's, as well as for conditions affecting memory and cognitive function. This is because NR2B is involved in synaptic plasticity, which is essential for learning and memory formation in the brain.