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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.

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Allergies play a major part in the health of children. The most prevalent childhood allergies are milk, egg, soy, wheat, peanuts, tree nuts, and seafood.

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Hyperthyroidism leads to an increased rate of metabolism and affects about 1% of women but only 0.1% of men. For most people, this increased metabolic rate causes the thyroid gland to become enlarged (known as a goiter).

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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.

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Recent studies have shown that the number of medication errors increases in relation to the number of orders that are verified per pharmacist, per work shift.

Operator, Repressor Operator, Repressor
Overload Principle Overload Principle
Operator using personal protection equipment. Operator using personal protection equipment.
Structural model of the Cro dimer–operator complex Structural model of the Cro dimer–operator complex
Models of the lac repressor and its binding to operator sites in DNA Models of the lac repressor and its binding to operator sites in DNA
Constitutive operator (OC) mutations Constitutive operator (OC) mutations
Video: Structures that affect circulation - arterioles and vasomotor responses and venous return

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