Characterization of pseudotyped SIV-based vector stocks.

(A) Infectious titers of SIVmac-based vector stocks pseudotyped with the indicated GPs and concentrated by ultracentrifugation. The mean titers ± SD from 9 individual experiments performed on TE671 target cells are shown. (B) Detection of physical particles was performed by immunoblotting of representative purified vector stocks using anti-SIV-CA (capsid) antibodies.