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The 170th residue in MLV/GaLV Env CT is critical for MLV infectivity. Representative Env incorporation with the indicated Env from three independent experiments is shown. Average relative infectivity normalized to that of MLV/GaLV Δ26 (170I*) and standard deviations from three independent experiments are shown. ****, P < 0.0001; ns, not significant (by unpaired and two-tailed Student's t test).
