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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").

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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

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Sildenafil (Viagra®) has two actions that may be of consequence in patients with heart disease. It can lower the blood pressure, and it can interact with nitrates. It should never be used in patients who are taking nitrates.

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The types of cancer that alpha interferons are used to treat include hairy cell leukemia, melanoma, follicular non-Hodgkin's lymphoma, and AIDS-related Kaposi's sarcoma.

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The eye muscles are the most active muscles in the whole body. The external muscles that move the eyes are the strongest muscles in the human body for the job they have to do. They are 100 times more powerful than they need to be.

Diagram of a flagellate stramenopile cell, showing characteristic flagellar hairs. Diagram of a flagellate stramenopile cell, showing characteristic flagellar hairs.
Flower part number is a characteristic difference between monocots and eudicots (a) Flowers and buds Flower part number is a characteristic difference between monocots and eudicots (a) Flowers and buds
Hartmann's mountain zebra resting, showing its characteristic essentially unbarred belly Hartmann's mountain zebra resting, showing its characteristic essentially unbarred belly
The hand on the right exhibits the orange-tinged skin characteristic of carotenodermia The hand on the right exhibits the orange-tinged skin characteristic of carotenodermia
Summary of Life's Characteristic Summary of Life's Characteristic
Chromatin states, gene content, and characteristic histone modifications Chromatin states, gene content, and characteristic histone modifications
Video: Insulin (glucose uptake by body cells), glycogenesis and lipogenesis

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