Our bodies still hold plenty of secrets, and scientists have just uncovered a doozy: the lungs play a key role in producing blood. Until now, this task was ascribed solely to bone marrow, but studies on mice at the University of California San Francisco (UCSF) have found that, surprisingly, the majority of the body’s platelets are produced in the lungs, as is a backup reservoir of blood stem cells that can step in when those in the bone marrow run dry.



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