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Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.

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If you could remove all of your skin, it would weigh up to 5 pounds.

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According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.

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Studies show that systolic blood pressure can be significantly lowered by taking statins. In fact, the higher the patient's baseline blood pressure, the greater the effect of statins on his or her blood pressure.

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Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.

The Endomembrane System The Endomembrane System
Primary glands of the endocrine system. Primary glands of the endocrine system.
The sympathetic and parasympathetic divisions of the autonomic nervous system. The sympathetic and parasympathetic divisions of the autonomic nervous system.
The limbic system is located within the higher brain, or cerebrum. The limbic system is located within the higher brain, or cerebrum.
RAA system RAA system
The Skeletal System and Its Functions The Skeletal System and Its Functions
Video: Chemical Messengers Animation

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