Using LLNL's Center for Accelerator Mass Spectrometry, scientist Bruce Buchholz measured the amount of carbon 14 in human insulin-forming beta cells' DNA and discovered that after age 30, the body does not create any new beta cells, thus decreasing the capacity to produce insulin as a person ages. More information at:
https://www.llnl.gov/news/newsreleases/2010/Oct/NR-10-10-05.html
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