from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun 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.
- noun immunology Any
cellthat expresses cell surface receptorsthat deliver signalsto either activateor inhibita responseas part of the immune system
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