MW: 28 kDa. Purified by a proprietary chromatographic technique with 95% purity on 12% SDS-PAGE. Over 40 million people are currently infected with HIV, and over 25 million deaths have been attributed to this virus infection since the beginning of the epidemic. HIV has two types, HIV-1 and HIV-2, HIV-1 is currently widespread, HIV-2 is majorly localized in Africa. HIV-1 has been classified into three subgroups O, M and N based on the sequences of gag and env genes. Mosaic HIV 1 and 2 antigen con