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Genes & Cells

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The bacteria in the guts of dairy cows have a larger collection of antibiotic resistance genes, which can be transfered to soil through manure, a new study suggests.

Compared with the backbone of Neandertals, the human spine, shown from the back (left) and side (right) may have a bit more curve in it because of differences in specific genes between the species, a new study shows.

Three neurons show differences in their myelin sheaths (white), in this computer illustration.

  • Genetics

    
    Science Ticker

    New antibiotic resistance genes found in cow manure

    Identifying these genes offers clues to how antibiotic resistance could move from agricultural ecosystems to other communities of organisms.

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    Science Ticker

    Neandertal, modern human DNA deviates even more

    An analysis of genetic material of Neandertals and modern humans shows genetic differences in the species' population sizes and even the curves of their spines.

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  • Cells

    
    Science Ticker

    Insulating sheath on nerve cells isn't an even coat

    Myelin doesn't evenly coat axons, a finding that runs counter to what scientists suspected.

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    Science Ticker

    Protein that gets sperm into egg identified

    The protein Folr4 on a reproductive egg plays this crucial role in the fusion of the sperm and egg, research shows.

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  • Development

    
    Scicurious

    The fluid part of semen plays a seminal role

    We often think of reproduction as involving only sperm and egg. But a new study highlights the seminal role of liquid semen in fertility and healthy offspring.

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    Science Ticker

    Mosquito sperm may sense smells

    Mosquitoes’ sperm may have chemical sensors that detect odors similar to the way the insect’s antennae sort smells.

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  • Physiology

    
    Scicurious

    Males compete all the way to sperm shape

    An association between the ratio of certain proteins in mouse sperm and sexual competition raises many questions about what exactly gives a sperm a good head.

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  • Immune Science

  • Microbiology

    
    Science Ticker

    Amoebas’ munching may cause diarrheal disease

    Amoebas biting and swallowing pieces of human cells may be what causes amebic dysentery, a potentially fatal diarrheal disease in the developing world.

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  • Epigenetics

    
    Science Ticker

    Chemical changes to genes make twins' pain differ

    Chemical changes to genes may make identical twins experience pain differently.

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    Letters to the Editor

    Feedback

    Readers discuss the names of really big numbers and whether Lamarckian evolution is making a comeback.
  • Molecular Evolution

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