Immunofluorescence staining was performed as described previously [87 (link)] using anti-Rab7 (diluted 1:100, Cell Signaling Technology, Danvers, Massachusetts, USA), anti-TLR7 (diluted 1:500, Novus Biologicals, Littleton, Colorado, USA), and Alexa Fluor 488 goat anti-rabbit IgG (diluted 1:2000, Thermo Fisher Scientific) as primary and secondary antibodies, respectively. After DNA counterstaining with ProLong Gold Antifade Reagent with DAPI (Thermo Fisher Scientific), images were acquired using a Nikon Eclipse Ti-U confocal microscope (Melville, New York, USA) at the Bioimaging Facility of the Sidney Kimmel Cancer Center at TJU.
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