1 definition by Dr. Persaud, Cornell University

Top Definition
ras
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.
Ras is fuckin cool (they're serious about this 20 letter minimum).
by Dr. Persaud, Cornell University August 04, 2004

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