The actual science involved: "The test measures expression levels of 14 small noncoding RNAs in saliva, including microRNAs. “MicroRNAs are messages the cells

The actual science involved: "The test measures expression levels of 14 small noncoding RNAs in saliva, including microRNAs. “MicroRNAs are messages the cells transmit in response to an event, like a brain injury,” Belli tells The Guardian. “The place where you find microRNAs most abundantly is saliva. Salivary glands are connected directly to the brain by nerves. We’re seeing this response within minutes of injury.” https://www.the-scientist.com/news-opinion/simple-spit-test-could-diagnose-concussions-68591 https://www.the-scientist.com/news-opinion/simple-spit-test-...