Neuroscience

Inflammation required for olfactory tissue regeneration

In a mouse study designed to understand how chronic inflammation in sinusitis damages the sense of smell, scientists at Johns Hopkins say they were surprised to learn that the regeneration of olfactory tissue requires some ...

Medical research

New clues in mice link cholesterol to fertility

Whether made by the body or ingested through diet, cholesterol plays a vital role in cells. Cholesterol also is a building block of steroids and hormones, including those that trigger puberty and support pregnancy. A new ...

Oncology & Cancer

Popular weed killer deemed probable carcinogen by UN

One of the world's most popular weed-killers—and the most widely used kind in the U.S.—has been labeled a probable carcinogen by the International Agency for Research on Cancer.

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Steroid

A steroid is a terpenoid lipid characterized by its sterane or steroid nucleus: a carbon skeleton with four fused rings, generally arranged in a 6-6-6-5 fashion. Steroids vary by the functional groups attached to these rings and the oxidation state of the rings. Hundreds of distinct steroids are found in plants, animals, and fungi. All steroids are made in cells either from the sterol lanosterol (animals and fungi) or from the sterol cycloartenol (plants). Both sterols are derived from the cyclization of the triterpene squalene.

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