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SIR is observed in the absence of Rev in cells infected by the wt but not VSV-g-coated viruses. Integration events per cell were estimated following (a) single infection with the indicated HIV-1s or (b) 1st-INF with ΔRev HIV-1 (m.o.i.=1) and 2nd-INF with the indicated ΔRev viruses (m.o.i.=1 or 10) at different time post-1st-INF.
