Examlex
When Lani has an unpleasant task to complete, such as writing a term paper, she sets up rewards for herself. When she completes her outline, she watches TV for one hour. When she completes the rough draft, she spends an evening relaxing with her friends. When she finishes the final draft, she goes to the mall and purchases a CD she has been wanting. The __________ best explains Lani's behavior.
Extracellular Antigens
Foreign substances outside cells that stimulate an immune response.
Subpopulation
A distinct group within a larger population that can be identified by certain characteristics or behaviors.
T Cells
A type of white blood cell that is vital for the immune response, recognizing and responding to pathogens and infected cells.
Cytotoxic
Adj. Referring to a substance or process that is toxic to cells, leading to cell damage or death.
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