Targeting Human Proteins to Treat HIV (image) University of Southern California Share Print E-Mail Caption Delta 20 (green) is highly expressed in HIV target cells that restrict acute HIV infection. Cell nuclei are shown in blue. Credit Wan-Lin Wu Usage Restrictions Please use caption and credit. Share Print E-Mail 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.