If
the DNA (deoxyribonucleic acid) molecules in a single human cell were stretched
out and laid endto-end they would measure approximately 6.5 feet (2 meters). The
average human body contains 10 to 20 billion miles (16 to 32 billion kilometers)
of DNA distributed among trillions of cells. If the total DNA in all the cells
from one human were unraveled, it would stretch to the sun and back more than
500 times.
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