Our body receives and processes a vast number of signals. Chemical signals serve as guidance cues and ensure, for example, that immune cells arrive exactly where they are needed. Many vital processes such as sensory perception, immune responses, cardiovascular function and communication between neurons are regulated by a large group of proteins on the cell surface: G protein-coupled receptors (GPCRs) pick up signals from the environment and transmit them to the cytoplasm of the cell.
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