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The senior population grows every year. Seniors older than 65 years of age now comprise more than 13% of the total population. However, women outlive men. In the 85-and-over age group, there are only 45 men to every 100 women.

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Lower drug doses for elderly patients should be used first, with titrations of the dose as tolerated to prevent unwanted drug-related pharmacodynamic effects.

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The strongest synthetic topical retinoid drug available, tazarotene, is used to treat sun-damaged skin, acne, and psoriasis.

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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.

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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.

Active and passive immunity Active and passive immunity
Purse cover, from the Sutton Hoo burial ship. Purse cover, from the Sutton Hoo burial ship.
The lower intake manifold attaches to the cylinder heads. The lower intake manifold attaches to the cylinder heads.
Passive touch by holding the head lightly. Passive touch by holding the head lightly.
Passive touch by holding the feet lightly. Passive touch by holding the feet lightly.
Embryonic development of shepherd’s purse (Capsella), a eudicot Embryonic development of shepherd’s purse (Capsella), a eudicot
Video: Griffith's experiments

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