Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).
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Cyanide works by making the human body unable to use oxygen.
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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
Tertiary and quaternary levels of structure
Levels of protein structure: Tertiary structure
Secondary and Tertiary Structure of Nucleic Acids
Plasticity of Secondary and Tertiary DNA Structure