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guanosine 5′-triphosphate[¦gwän·ə‚sēn ¦fīv‚prīm trī′fäs‚fāt]
(cell and molecular biology)
A nucleoside triphosphate that is instrumental in many cellular processes, including microtubule assembly, protein synthesis, and cell signaling, due to the energy it releases upon removal of its terminal phosphate group (producing guanosine 5′-diphosphate). Abbreviated GTP.