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Heterotrimeric G protein molecule
Heterotrimeric G protein molecule. Molecular model of a heterotrimeric G protein. This protein has three different subunits (heterotrimer), alpha, beta and gamma. G proteins, or guanine nucleotide binding proteins, are molecular switches involved in signal transduction. Heterotrimeric G proteins relay signals from cell surface receptors to their effectors, including ion channels and enzymes, within a cell.
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