The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.
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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 may make getting pregnant impossible.
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Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.
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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.
The b sheet, another common secondary structure in proteins
Secondary and Tertiary Structure of Nucleic Acids
Internal structure of the nose—lateral view
Skeletal Structure of a Hog
IgG Antibody Structure
The homotetrameric structure of the lac repressor protein