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The holding-period return (HPR) for a stock is equal to
Immune System Components
The cells and molecules, including antibodies, white blood cells, and the complement system, that work together to protect the body from infection and disease.
Adaptive Immune Response
The body's immune system's ability to recognize and specifically react to pathogens through the activation of lymphocytes, providing long-lasting protection.
Active Immunity
Immunity that develops as a result of exposure to antigens; it can occur naturally after recovery from a disease or can be artificially induced by immunization with a vaccine. Compare with passive immunity.
Passive Immunity
Temporary immunity that depends on the presence of immunoglobulins produced by another organism. Compare with active immunity.
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