The cell fragments play a role in the body’s first line of defense against bacterial infection, helping white blood cells grab blood-borne bacteria in the liver.
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In avian species, a gene induces programmed cell death during development in the area where a phallus would otherwise grow.
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As new infections surface and spread, science meets the challenges with ingenuity and adaptation.
A newly discovered fossil of what may be the earliest known bird redraws the picture of the early avian evolution, but some researchers are not convinced.
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The activity of one type of immune cell helps regrow the limbs of amputated salamanders.
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