Study: 'Microbial dark matter' may cause periodontitis
A new study may shed light on the role of "microbial dark matter" in the progression of periodontitis and other diseases, according to results published online in the Proceedings of the National Academy of Sciences. While the human body contains 10 times more bacterial cells than human cells, scientists estimate that roughly half of the bacteria are difficult to replicate for research — hence the term "microbial dark matter," explained a press release from the University of California, Los Angeles. A long-standing question is whether these bacteria contribute to chronic disease.
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