Fig. 1.
Retroviral vectors.
The EcoR1 and Xba1 restriction sites used for determining proviral integration sites and the full-length provirus are indicated. LTR, long terminal repeat; IRES, internal ribosome entry site; X, Xba1; E, EcoR1; N, Nco1; S,Sal1; B, BamH1; H, Hind111.