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Of biological background, Ras refers to a monomeric, oncogenic guanine nucleotide binding protein (G-protein) [associated] with the cell membrane of [essentially] all eukaryotic cells. When activated by binding of a pro-proliferative extracellular ligand to its cellular receptor, Ras releases its guanosine diphosphate in exchange for guanosine triphosphate, thus activating it. It then propagates the [proliferation] activation signal through a MAP-kinase dependent pathway causing altered gene expression giving rise to the onset of the cell cycle.
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