TAT and infection: Further, we will discuss evidence on the role of anti-Tat Abs in blocking the formation of the Tat/Env complex that allows for Tat-mediated HIV entry through the RGD (arginyl-glycyl-aspartic acid tripeptide) binding integrins α5β1, αvβ3, and αvβ5, and it enhances the infection of cells expressing these integrins, such as dendritic cells (DCs).