CMV in Rhesus Monkeys (IMAGE) Duke University Medical Center Caption For the first time, CMV is shown to cross the placenta in primates other than humans, allowing scientists to define the important role of the mother's CD4 "helper" T cells, which signal CD8 'killer' T cells and antibody-making B cells to disarm the pathogens en route. Credit Mark Dubowski for Duke Medicine Usage Restrictions None 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.