TMEM97 and pancreatic neoplasm: Recently characterized fluorescent sigma-2 receptor ligands SW120 (derivative of SW43) [16] and PB385 (derivative of PB282) [17], colocalize with LysoTracker Red in Bxpc3 pancreatic cancer cells by confocal microscopy (Figure 3), and also appreciated by fluorescent microscopy in Bxpc3 and Aspc1 (Additional file 2 figure S2A).