Human T-Cell Leukemia Virus Type II Directly Acts on CD34+ Hematopoietic Precursors by Increasing Their Survival Potential. Envelope-Associated HLA Class II Molecules Reverse This Effect by Claudio Casoli, Maria Carla Re, Paola Monari, Giuliano Furlini, Giovanna Tosi, Chiara Gradozzi, Pier Paolo Dall'Aglio, Umberto Bertazzoni, and Roberto S. Accolla Blood Volume 91(7):2296-2304 April 1, 1998 ©1998 by American Society of Hematology Assessment of HTLV-II proviral DNA in TF-1 cell line by PCR amplification of a tax gene sequence. Claudio Casoli et al. Blood 1998;91:2296-2304 ©1998 by American Society of Hematology Immunoblot analysis of HTLV-II virus lysates after reaction with MoAbs specific for HLA class-I (B9.12.1) or class-II (D1.12 and Tu35). Claudio Casoli et al. Blood 1998;91:2296-2304 ©1998 by American Society of Hematology Measurement of TF-1 cell proliferation after incubation with HTLV-II virus. Claudio Casoli et al. Blood 1998;91:2296-2304 ©1998 by American Society of Hematology