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Not just familiarity for the public, but also for doctors. Physicians and researchers will gain invaluable knowledge about stem cell therapies. By learning to grow new breast tissue, we'll be much better prepared to grow, say, liver tissue, or lung tissue.
Cosmetic procedures are an ideal, high-profit incentive venue to get pharmaceutical companies to invest in innovative new treatments.
And if fake breasts become, well, a little less fake, that's probably a win too.