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  1. 19010

    This article describes the myelin sheath as “made of protein.” However, Merriam-Webster’s Collegiate Dictionary (online) provides the following definition of myelin: “a soft white somewhat fatty material …” (emphasis added). Ann M. ThrockmortonLa Mesa, Calif. That’s right. There was an oversimplification in the story. Myelin is made up mostly of lipids .–D. Christensen

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  2. Health & Medicine

    Learning from leprosy’s nerve damage

    The bacterium that causes leprosy directly damages a protective sheathing around many nerve cells.

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  3. 19009

    I am puzzled at the great concern over the problem of mercury thermometers, as noted in this article. I grant that mercury is a hazard, and I am glad that mercury thermometers are disappearing.