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Lea Ament, left, and Tamara Nunley talk about the care their team provided for Helen and Robert Valenzuela at St. Jude Medical Center in Fullerton.
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Within the first few weeks of pregnancy, an embryo splits into three layers. The outermost layer, the ectoderm, contributes to a number of structures including the skin, teeth, hair and sweat glands. In humans, sweat glands develop between 20 and 30 weeks, the researchers wrote. If they don't form correctly, there may be no going back.
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