HTLV-1 Envelope protein.The protein contains the C-terminus of gp46 and mostof p21E of HTLV-1. This non-fusion E.coli derived proteinstarts from HIV-1 envelope amino acids 165 and ends with440.The protein is purified by proprietary chromatographictechnique.Human T-cell leukemia virus (HTLV)-1 and-2 are deltaretroviruses that infect a wide range of cells. HTLV-1 has beenfound primarily in CD4+ and CD8 T cellslymphocytes in vivo,whereas CD8 T cellslymphocytes are thought to be the in vivoreservoir of HTLV-2. Purity >95% by SDS-PAGE and RP-HPLC