Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.
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More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.
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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
bone structure
The Structure of the Atmosphere
Structure of a typical cell membrane
A model for kinetochore structure and organization
Orientation and structure of a nephron, the functional unit of the kidney.