tokens: The promoters of the adenovirus 2 major late gene , the mouse beta-globin gene , the mouse immunoglobulin VH gene and the LTR of the human T-lymphotropic retrovirus type I were tested for their transcription activities in cell-free extracts of four cell lines ; HeLa , CESS ( Epstein-Barr virus-transformed human B cell line ) , MT-1 ( HTLV-I-infected human T cell line without viral protein synthesis ) , and MT-2 ( HTLV-I-infected human T cell line producing viral proteins ) .