This work was supported by a grant fromthe International Atomic Energy Agency (IAEA) (grantNo: 12510/R1) ;a grant from the Chinese NationalNatural Science Foundation (grant No: 30400120)
Although the endogenous function of Tat has been elucidated in the past twenty years, the study of its exogenous activity has been hampered due to the difficulty of large scale preparation of the active Tat protein. T...