Cells were harvested and resuspended in PBS containing a 1:50 dilution of viability dye Zombie Aqua (30 (link)) for 10 minutes at room temperature and washed following the manufacturer’s protocol (BioLegend). Cells were then resuspended in 50 μL of fluorescence-activated cell sorting (FACS) buffer (BD Bioscience), and fluorophore-conjugated antibodies were added at 1:25 dilution, incubated for 15 minutes at 4°C. Antibodies were washed away twice by sequential centrifugation at 1400 RPM with FACS buffer and acquired in a BD Fortessa flow cytometer using FACSDiva software. Analysis of flow cytometry files was performed using FlowJo v 10.7 software.