FIG. 4.

GALV and A-MuLV exhibit reciprocal interference when infecting the glycosylation-deficient CHOK1 derivative cell line Lec8. The titers with Lec8 for each vector were considered 100, and the titers afforded by cells productively infected with GALV(SEATO) or A-MuLV(4070A) were normalized to this number. PG13-BSN supernatant gave a titer of (7.1 ± 0.2) × 10⁴ BFU/ml, and PA317-BSN supernatant gave a titer of (9.1 ± 0.3) × 10⁴ BFU/ml. The assays were done as described in Materials and Methods.