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When does a chromosome go from one chromatid to two sister chromatids?
Antibody
Proteins produced by the immune system to identify and neutralize foreign objects like bacteria and viruses.
Immune System
The body's defense mechanism against infections, diseases, and other potentially damaging foreign bodies.
Foreign Invaders
External pathogens such as viruses, bacteria, and other microbes that can cause disease in a host organism.
White Blood Cells
Cells of the immune system that are involved in protecting the body against both infectious disease and foreign invaders.
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