Space experiment sheds light on immune struggles

A lab experiment that rode to space two years ago has offered new clues about why astronauts' immune systems struggle to perform in zero gravity, US military researchers said on Monday.


Endotoxins (not to be confused with exotoxin) are toxins associated with some Gram-negative bacteria. An "endotoxin" is a toxin that is a structural molecule of the bacteria that is recognized by the immune system.

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