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Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.

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According to the American College of Allergy, Asthma & Immunology, more than 50 million Americans have some kind of food allergy. Food allergies affect between 4 and 6% of children, and 4% of adults, according to the CDC. The most common food allergies include shellfish, peanuts, walnuts, fish, eggs, milk, and soy.

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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.

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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.

Telomere sequences at the end of a human chromosome Telomere sequences at the end of a human chromosome
Insect species diversity on British host trees supports the area hypothesis. Insect species diversity on British host trees supports the area hypothesis.
These species are all at risk of extinction. These species are all at risk of extinction.
The crania, and especially the faces of KNM-ER 1813 and 1470, differ enough that some scientists inc The crania, and especially the faces of KNM-ER 1813 and 1470, differ enough that some scientists inc
Time Line of Human History From Upper Paleolithic Period to the Present Time Line of Human History From Upper Paleolithic Period to the Present
Structures of human DNA polymerase g (left) and T7 phage DNA polymerase (right) holoenzymes Structures of human DNA polymerase g (left) and T7 phage DNA polymerase (right) holoenzymes
Video: Structures that affect circulation - arterioles and vasomotor responses

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