The plane then went down about three miles from the airport in a residential neighborhood in West Los Angeles, a few miles from the University of California, Los Angeles, said Gregor.

CNN: 1 killed after plane crashes in Los Angeles neighborhood

But probiotics aren't all created equal, said University of Western Ontario microbiologist Gregor Reid who has studied them.

CNN: Best cure for stomach troubles-- which probiotics work and why

Lead author Michael Dunn, an evolutionary linguist at the Max Planck Institute for Psycholinguistics in the Netherlands, said the approach is akin to the study of pea plants by Gregor Mendel, which ultimately led to the idea of heritability of traits.

BBC: Language universality idea tested with biology method