Body & Brain

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Twins

MATCHED PAIR  Studies of more than 14 million sets of twins indicate that human traits, on average, are dictated equally by genes and environment.

illustration of Ebola entering the cell

VIRAL ENTRY  The Ebola virus hijacks a protein called NPC1 to invade a host cell.

pain path

HOW IT HURTS  Rare mutations in the gene PRDM12 prevent proper development of pain-sensing fibers that carry pain signals from the skin to the brain, rendering people impervious to pain, a new study suggests. 

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