Biomedicine

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nerve cells affected by iron levels in the brain

RISK FACTOR  Pigmented nerve cells (black U-shape, center) in the human brain die in Parkinson’s disease, destruction that may be affected by iron levels.  

resting person

RESTING UNEASY  Part of the left brain remains vigilant while sleeping in a strange place, a new study suggests. 

Wild mice and pet-store mice

EXPERIENCE MATTERS  Wild mice (one shown left) and pet-store mice have dealt with infections, which trained their immune systems to react similarly to an adult human’s. Lab mice (one shown right) are kept in sterile environments. Their immune systems react more like a newborn baby’s or a person in a hermetically sealed room.

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