FIG. 7.

(A) Schematic of chimeric recombinant SN-BG NCD, which contains the ectodomain and transmembrane domain of SB on the backbone of the SN parental virus. The number 461 indicates the position of the amino acid in G where the CD begins. LS, leader sequence; TS, trailer sequence; ψ, pseudogene. (B) Single-step growth curves of the chimeric and parental recombinant viruses in NA cells. Data are the means (± SE) of results from three independent experiments. FFU, focus-forming units. (C) Spread of the recombinant viruses in Vero cells. Data are the mean areas (± SE) for 30 foci. The asterisk indicates a significant difference (P < 0.05).