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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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Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.

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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.

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The most common treatment options for addiction include psychotherapy, support groups, and individual counseling.

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

The organization of mRNA as a translational unit The organization of mRNA as a translational unit
Human body: levels of organization. Human body: levels of organization.
Typical Organization of the CPT Manual Typical Organization of the CPT Manual
Example of Tabular List organization levels and formatting. Example of Tabular List organization levels and formatting.
Hierarchical nature of hormone action in vertebrates Hierarchical nature of hormone action in vertebrates
Levels of Ecological Organization Levels of Ecological Organization
Video: Primary and secondary response to infection

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