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Analysis of mature and immature virus particles encoding truncated Env proteins for the ability to fuse with cells. (A) BlaM-containing mature and immature HIV-1 particles were assayed for fusion with SupT1 cells. The relative fusion signals were normalized by p24 and BlaM activity as described in Materials and Methods. (B) Ratio of fusion efficiency of mature to immature virus particles. Shown are the mean values and standard deviations of three independent determinations.
