Rhesus Macaques Eating a Pumpkin (IMAGE) University of California - Davis Caption Rhesus macaque monkeys that were less certain about their social position had higher levels of inflammatory proteins than those with more certainty, a study at the California National Primate Research Center at UC Davis found. The results suggest that social uncertainty might impact health. Credit California National Primate Research Center Usage Restrictions May be used with acknowledgement of the source. 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.