FIG. 3.

Susceptibility of GGG, GGR, and GGrG cells to pseudotype virus bearing mutant FeLV-B envelopes. (A) The chimeric baBB and mutant baBB envelopes were generated in our previous study (35). Divergent residues are underlined in the AAA sequence, and unchanged amino acids are indicated by dots. The conserved cysteines are highlighted in boldface. (B) Infection of MDTF cells expressing the GGG (Pit1), GGR, or GGrG receptor with lacZ pseudotype virus bearing mutant baBB envelopes. Topological diagrams of the chimeric receptors are shown above the histograms. Titers are mean values of three infection studies; error bars are indicated.