G Protein

 
G protein: These molecules have been described as "biological traffic lights." Located inside the cell, G proteins are able respond to signals outside the cell -- light, smell, hormones -- and translate (transduce) these signals into action within the cell.

Alfred G. Gilman and Martin Rodbell shared the 1994 Nobel Prize in Physiology or Medicine for "their discovery of G- proteins and the role of these proteins in signal transduction in cells."

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