The process by which cells detect, process, and respond to external stimuli by converting one type of signal into another. This involves a cascade of molecular events that amplify and transmit information from outside the cell to its interior.
From Latin 'signum' meaning mark or sign, and 'transducere' meaning to lead across. The term gained prominence in biology during the 1960s-70s as scientists began understanding how cells communicate and respond to their environment at the molecular level.
Signal transduction is like a cellular game of telephone, but with incredible precision and amplification! A single molecule binding to a receptor can trigger a cascade that affects thousands of proteins, allowing cells to make life-or-death decisions based on tiny environmental changes.
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