Cells were washed (4) with PBS and permeabilization solution (0.25% Triton X-100 in PBS) added and incubated
for 30 min at room temperature. Again, cells were washed (4) with PBS before blocking solution (0.3 M Glycine + 10% Goat serum in 1% BSA in PBST (PBS + 0.01% Tween 20) was added for a further 1 h.