Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A protein that is found near cell membranes and regulates cell division and proliferation. Abnormal ras proteins facilitate uncontrolled cell division, leading to the development of tumors.
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
[ra(t) s(arcoma), from the fact that genes coding for abnormal ras proteins were first isolated from rat sarcomas.]
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