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g-protein

G protein Illustration and Icon

G protein

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A stylized molecular schematic depicts a guanine nucleotide–binding protein that mediates signal transduction downstream of a G protein–coupled receptor (GPCR) on the cytoplasmic face of the plasma membrane. In biological hierarchy, it is a protein molecule operating within a cellular signaling pathway. In biochemistry and physiology, it cycles between GDP (guanosine diphosphate) and GTP (guanosine triphosphate) states to regulate downstream effectors, enabling amplification of extracellular cues into intracellular responses.

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