Fig. 1. Restriction of N-MLV in AGM cell lines but not those of other primates that restrict HIV-1 or SIVmac. Each primate cell line was infected with serially diluted N-GFP or B-GFP vectors. Each vector stock was also titrated on Fv1-null MDTF cells, and the inoculum level is given in MDTF infectious units (i.u.). The percentage of infected (GFP-positive) cells is plotted for each level of N-GFP or B-GFP inoculum.