Fig. 3. Triple immunostaining of APP, BACE and endosomal (EEA1) (A)/lysosomal
(Lamp-1) (B) markers. (A) Co-localization of APP and BACE in endosomes at 15
minutes. At 15 minutes, most signal was found in the endosomes (confirmed by
EEA1 staining), showing complete co-localization of APP and BACE. (B) Distinct
localization of APP and BACE at 60 minutes. APP signal was found mostly in
lysosomes (confirmed by Lamp1), however BACE signal was not. Bar, 20
µm.