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Health & MedicineNew Clues: Gene variations may contribute to MS risk
Variants of two genes encoding immune system proteins may confer a higher risk for multiple sclerosis.
By Nathan Seppa -
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ChemistrySoot Sense: Test tallies exposure to diesel pollution
A chemical in urine reveals a person's exposure to diesel exhaust.
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Fatherless Stem Cells: Scientific fraud involved an accidental advance
Stem cells that discredited researcher Woo Suk Hwang claimed as the first example of human cloning actually came from embryos that contained only the mother's genetic material.