Protein samples were prepared by boiling the pelleted cells in radioimmunoprecipitation assay buffer, as described (41 (link)). The membranes were probed with 1:5000 mouse monoclonal anti-HA (16B12; Covance), 1:5000 rabbit polyclonal anti-FRB (from David Shore, University of Geneva), 1:5000 rabbit polyclonal anti-RAP1 (from David Shore, University of Geneva), 1:10,000 rabbit polyclonal anti–glyceraldehyde-3-phosphate dehydrogenase (A9521; Sigma-Aldrich), and 1:5000 mouse monoclonal anti-GFP antibodies (11814460001, Roche). Horseradish peroxidase–conjugated goat anti-mouse (Bio-Rad) or anti-rabbit (A8275, Sigma-Aldrich) immunoglobulin G were used at 1:10,000 as secondary antibodies.