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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
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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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In 1864, the first barbiturate (barbituric acid) was synthesized.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.