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Genetics

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mouse nerve cells

COMING INTO THEIR OWN  Mouse nerve cells (red) grown in a dish each sport a hairlike filament called a primary cilium (green), which may have many roles in the brain. 

Southeast Asian hunter-gatherers

SCENT MASTERS  Southeast Asian hunter-gatherer communities display an ability to name different odors that's not observed in Western nations or even in a neighboring farming group. Here, two of these hunter-gatherers clear an area to enable the growth of durian, a sweet-tasting but foul-smelling fruit.

Streptococcus pyogenes

BUGGED  In this scanning electron microscope image, Streptococcus pyogenes bacteria (yellow) are shown on top of a white blood cell. Different strains of the bacteria trigger a different reaction from the immune system thanks to extra genes that vary among strains.

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