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HIV proteins in Ψ422 cells. 35S-labeled viral proteins from HeLa cells (negative control, lane 1), HIV-1-MN-infected HeLa-T4 cells (positive control, lane 2), or Ψ422 cells (lane 3) were immunoprecipitated with a pool of AIDS sera and resolved by electrophoresis on an SDS/polyacrylamide gel. Positions of molecular mass markers are indicated on the right.
