Texas Biomed HIV vaccine concept (IMAGE) Texas Biomedical Research Institute Caption The vaccine is designed to specifically enter basal, or base, cells in the mucosal epithelium. As those basal cells differentiate to build up the epithelial tissue, the vaccine is passed on to all newly made cells (represented in green). Credit Texas Biomed Usage Restrictions may reuse 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.