MUC7 Diagram (IMAGE) University at Buffalo Caption An illustration shows the MUC7 protein in humans. This bottlebrush-shaped protein, found in saliva, contains repeating units (shown in blue). Repeats of this kind may have conferred an evolutionary advantage to humans and other primates, possibly by enhancing traits of saliva such as its lubricity and its ability to bind to microbes (a capability that may help curb disease). Credit Credit: Duo "Erica" Xu Usage Restrictions This image may only be used with news stories discussing the research outlined in the associated press release. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.