from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A lymphocyte that is activated by double-stranded RNA or lymphokines and fights off viral infections and tumors without evident antigenic specificity.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any cell that expresses cell surface receptors that deliver signals to either activate or inhibit a response as part of the immune system
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