Confocal microscopy was used to observe the dynamic surface binding and internalization of mAb and ADC in NET cells following our established protocol.(38 (link), 39 ) Specifically, BacMam GFP Transduction Control was used to stain the cytoplasm and nucleus, and the AF647-mAb or AF647-ADC was used to target cells. The stained cells were observed using an Olympus 1X-81 confocal microscope with a laser scanning head (Olympus IX81, Center Valley, PA). The MitoSox images were recorded and analyzed offline via ImageJ software.