Microscopy image of HIV vaccine in tissue (IMAGE) Texas Biomedical Research Institute Caption A microscopy image of vaginal tissue from a female macaque vaccinated with a version of the vaccine. The white line is the basal or base layer of the mucosal epithelium, which is the interior tissue lining; cells stained in blue have built up along the lining through the menses cycle; and cells glowing green contain the vaccine, forming the top layer of the lining, which pathogens would encounter first. Credit Texas Biomed Usage Restrictions may resuse with credit License Original 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.