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Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.

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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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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.

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

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More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.

How people use space as they interact is studied by sociologists who have a microsociological focus. ... How people use space as they interact is studied by sociologists who have a microsociological focus. ...
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Development of the Reproductive Systems Development of the Reproductive Systems
Functional divisions of vertebrate nervous systems Functional divisions of vertebrate nervous systems
Energy homeostasis is regulated primarily by the brain, gastrointestinal tract, other organ systems, Energy homeostasis is regulated primarily by the brain, gastrointestinal tract, other organ systems,
Video: Gastrin (protein digestion)

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