Investigating HIV's Pathway to Humans (IMAGE) Kyoto University Caption Utilizing the humanized mouse model the team found that HIV-1 Vpu inhibiting tetherin at the beginning of infection (right) is key for successful viral infection. SIVcpz Vpu does not have this function (left) adapting and evolving in order to jump to humans. Credit Kyoto University / Sato Lab 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.