Product Specifications HIV-1 envelope 101 antigen recombinant: Description: Produced in genetically engineered yeast cells as a fusion with human superoxide dismutase (SOD). It covers from Ala 548 to Leu 767 of the HIV-1 (SF2 isolate) envelope protein. It has been purified by differential extraction followed by gel filtration chromatography.Mol Weight: 41.7 KDa.Purity: Over 90