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16 years later, the team thawed and grafted those tissue pieces back, and about a year later, they actually kickstarted sperm production.
This is a big deal for young boys facing cancer, since they can't freeze sperm like adults; this technique could give them a real shot at having biological kids someday.
Over 3,000 boys worldwide have stored testicular tissue since 2002, but this is the first clear proof it can work in humans.