2.3. Flow Cytometric Analysis. The cells were incubated with
the anti-GRP78 antibody (Abcam) or rabbit isotype IgG for
1 h on ice, washed with cold PBS for 3 times, and then incubated
with saturating concentrations of FITC-conjugated
goat anti-rabbit IgG for 30min at 4∘C. After washing with
PBS, the cells were fixed with 2% formaldehyde in PBS. The
cell surface GRP78 was analyzed by flow cytometry performed
on a FACScan (BD Biosciences).