Human T-cell lymphotropic virus I ( HTLV-I ) encodes for a 40-kDa protein , Tax , which is important for the immortalization of T cells .
human t-cell lymphotropic virus i ( htlv-i ) encodes for a 40-kda protein , tax , which is important for the immortalization of t cells .
B-virus I-virus I-virus I-virus I-virus O B-virus O O O O B-protein_molecule I-protein_molecule O B-protein_molecule O O O O O O O O B-cell_type I-cell_type O