Ultrasensitivity refers to a phenomenon in biochemistry and cellular signaling whereby a small change in the concentration of a signaling molecule or stimulant can produce a disproportionately large response from a biological system. This occurs in various biological processes, including receptor signaling pathways, gene expression, and metabolic regulation. In ultrasensitive systems, the relationship between the input (e.g., ligand concentration) and the output (e.g., cellular response) is characterized by steep sigmoidal curves rather than linear responses.
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