1. Natural Killer Cells Thought to recognize and destroy tumor cells and some virally-infected cells through a self/non-self recognition process.

2. – Exact physiological roles are unclear; they may be able to recognize and destroy cancer cells and cells infected with certain kinds of viruses. – NK cells make up 10-15% of the circulating lymphocytes in the adult Natural killer cells result from differentiation of the lymphoblast in the lineage tree

3. Critical thinking Would natural killer cells be considered a part of nonspecific or specific immunity? Do a web search (and I-search) Come to a decision as a group and provide evidence for your conclusion.

4. “NK cells are sometimes considered to be one of the innate immunity mechanisms, because it is unclear how or whether these cells develop responses to specific stimuli.”(Dee, Puleo, Bizios, 2002) Discuss