Fig. 7. Quantification of STxB localization in SNX2-suppressed cells and cells that were jointly suppressed for SNX1 and SNX2. (A) The assay was performed as described for Fig. 3 and the localization of FITC-STxB in >600 cells was scored after 30 minutes of toxin uptake, as described for Fig. 3. (B) Representative data set for TGN-like accumulation of FITC-STxB over time (n>600 for each sample; scored for 30, 60 and 120 minutes) for control cells and, SNX2-suppressed cells and cells that were jointly suppressed for SNX1 and SNX2. (C) SNX2 clustering in the perinuclear area is dependent on SNX1. Control and SNX1-suppressed cell were subjected to a FITC-STxB-uptake assay (green channel). The toxin was surface-bound at 4°C and internalized at 37°C for 30 minutes. Fixed cells were immunolabeled with anti-SNX2 antibody (Alexa633, red cannel). Bar, 10 µm.