ERBB2 and neoplasm: HER2-expressing NCI-N87 cells and NIH/3T3 control cells were stained with Tra-Alexa488 and Per-IR700 fluorescence dyes that both accumulated predominantly in NCI-N87 cells but were not visualized in NIH/3T3 cells, which showed that Tra-Alexa488 and Per-IR700 specifically binds to HER2-expressing tumor cells.