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Between 1864 and 1900, the largest portion of railroad track (as a percentage of total annual construction) was laid in which region of the U.S.?
Autoantibody
An antibody produced by the immune system that mistakenly targets and attacks the body's own tissues or cells.
Phagocytosis
The process by which cells, especially immune cells, engulf and digest foreign particles or pathogens.
Antigens
Substances that the immune system recognizes as foreign or dangerous, triggering an immune response.
Adjunct Therapy
Treatment used together with the primary treatment to enhance its effectiveness.
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