Innate Immune Response Against HIV (IMAGE) Scripps Research Institute Caption For innate immune system activation against HIV-1, Scripps Research scientists have found that the protein PQBP1’s recognition of incoming HIV-1 particles (depicted in red) is required for cGAS activation, a production of cGAMP (depicted in green), in human dendritic cells. Nuclei (Dapi) are depicted in blue. Credit Scripps Research Usage Restrictions For related coverage and 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.