CNN Sanjay Gupta MD December 14, 2014 12:43:00
>> the vast majority of mutations are are actually not a threat. so to figure out which mutations are are dangerous, he is going back in time. >> this national treasure -- in the basement of the john wayne cancer institute in santa monica, california, decades of cancer tissues were stored by scientists in deep freeze vats. now he wants to use technology that didn't exist back then to map the gee nom genomes. >> so even after a patient died, samples were stored here. they can go back and say they have this mutation and now we're going to see if this leads to death and other mutations may not. >...
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