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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.

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To prove that stomach ulcers were caused by bacteria and not by stress, a researcher consumed an entire laboratory beaker full of bacterial culture. After this, he did indeed develop stomach ulcers, and won the Nobel Prize for his discovery.

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For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.

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The longest a person has survived after a heart transplant is 24 years.

A Passive Continental Margin A Passive Continental Margin
The lower intake manifold attaches to the cylinder heads. The lower intake manifold attaches to the cylinder heads.
A reverse passive agglutination reaction. The antibody is bound to the particles, and antigen in the ... A reverse passive agglutination reaction. The antibody is bound to the particles, and antigen in the ...
Passive stretching enhances joint function. Passive stretching enhances joint function.
Passive movement of the hip through its full range. With one hand just above the knee and the other ... Passive movement of the hip through its full range. With one hand just above the knee and the other ...
Embryonic development of shepherd’s purse (Capsella), a eudicot Embryonic development of shepherd’s purse (Capsella), a eudicot
Video: Interview with Person having Obsessive Compulsive Disorder

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