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The first monoclonal antibodies were made exclusively from mouse cells. Some are now fully human, which means they are likely to be safer and may be more effective than older monoclonal antibodies.

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Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).

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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).

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About 80% of major fungal systemic infections are due to Candida albicans. Another form, Candida peritonitis, occurs most often in postoperative patients. A rare disease, Candida meningitis, may follow leukemia, kidney transplant, other immunosuppressed factors, or when suffering from Candida septicemia.

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Hip fractures are the most serious consequences of osteoporosis. The incidence of hip fractures increases with each decade among patients in their 60s to patients in their 90s for both women and men of all populations. Men and women older than 80 years of age show the highest incidence of hip fractures.

A vasectomy, showing how each vas deferens is tied off in two places and then a section is removed f A vasectomy, showing how each vas deferens is tied off in two places and then a section is removed f
Sperm by the fallopian tube Sperm by the fallopian tube
Tertiary structure of sperm whale myoglobin Tertiary structure of sperm whale myoglobin
sperm cell sperm cell
Motile sperm cells of algae and seedless plants. Motile sperm cells of algae and seedless plants.
Sperm and Egg Cell Movements Before and After Fertilization Sperm and Egg Cell Movements Before and After Fertilization
Video: Sigmoidoscopy

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