Fig. 1.
The chimeric envelope expression constructs. Plasmid constructs encoding SCFXMo and SCFXA. The general format is shown diagrammatically and the amino acid sequence surrounding the site of fusion between the displayed ligand and the envelope protein is shown in detail. LTR, long terminal repeat; L, envelope signal peptide; phleor, phleomycin resistance gene. The Sfi 1 andNot 1 cloning sites are shown.