Downregulation and upregulation are biological processes that describe how cells respond to various stimuli by increasing or decreasing the abundance of specific receptors, proteins, or enzymes. These processes are crucial for maintaining homeostasis in biological systems and for the adaptation of cells to changes in their environment. ### Downregulation - **Definition**: Downregulation refers to the process by which a cell decreases the number or sensitivity of receptors or proteins in response to an external stimulus.
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