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  1. Genetics

    Penicillin allergies may be linked to one immune system gene

    Researchers have located a shared hot spot — on the HLA-B gene — in the immune system in people who say they have penicillin allergies.

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  2. Neuroscience

    FDA advisory panel declines to support a controversial Alzheimer’s treatment

    The fate of an Alzheimer’s drug, developed by pharmaceutical company Biogen, remains up in the air.

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  3. Readers ask about positronium, wild bees and more

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  4. In praise of serendipity — and scientific obsession

    Editor in chief Nancy Shute writes about the role of serendipity and scientific obsession played in this month's feature stories.