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When participants are selected for a pretest-posttest design because they have extremely low or extremely high scores on the dependent variable, researchers must be on the lookout for
Psychoneuroimmunology
The study of the connections among stress, the body’s immune system, and illness.
Immune System
A complex network of cells, tissues, and organs that work together to defend the body against attacks by foreign invaders, such as bacteria, viruses, parasites, and fungi.
Antigens
Molecules or substances that the immune system identifies as foreign, triggering an immune response.
Cancer Cells
Abnormal cells that divide uncontrollably and can invade nearby tissues or spread to other parts of the body through the blood and lymph systems.
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