In perception, a knock-out mouse is one in which

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A knock-out mouse is a genetically engineered mouse in which researchers have inactivated, or "knocked out," an existing gene by replacing it or disrupting it with an artificial piece of DNA. This process is often used to study the role of specific genes in various biological processes, including perception. Choices B, C, and D involve introducing genes or specific brain areas, which does not describe the process of creating a knock-out mouse.

In Perception, a Knock-Out Mouse Is One in Which