Further, cells were fixed with 4% chilled paraformaldehyde (Sigma-Aldrich, MO, USA) in phosphate buffer saline (PBS)
for 15min and permeabilized (0.25% Triton X-100 in PBS; Sigma-Aldrich, MO, USA) for 20 min at room temperature.
Subsequent stepswere as permanufacturer’s protocol. Finally,cover slips were washed with PBS and observed under a
fluorescence microscope.