BUFFALO, NEW YORK—According to a report in The International Business Times, researchers led by Omer Gokcumen of the University at Buffalo say they detected a “ghost” species of ancient hominin while they were studying a protein that occurs in saliva and its influence on the bacteria in the human mouth. To study the protein, known as MUC7, the researchers examined the MUC7 gene in more than 2,500 modern human genomes. The researchers say a version of the gene found in people living in sub-Saharan Africa was “wildly different” from those found in other modern humans. Gokcumen explained that even the MUC7 genes from Neanderthal and Denisovan samples were closer to those of other modern human populations than the sub-Saharan variant. He thinks the variation may have been introduced to the population by an as-yet-undiscovered hominin that lived as recently as 150,000 years ago, based upon gene mutation rates. For more, go to “Proteins Solve a Hominin Puzzle.”