Fig. 4From: Fluorescent imaging of superficial head and neck squamous cell carcinoma using a γ-glutamyltranspeptidase-activated targeting agent: a pilot studyFluorescence intensity of tumor versus normal epithelium after spraying gGlu-HMRG. a An example of tracing the region of interest (ROI, case #7). Scale bars, 2 mm. b Time course of fluorescence intensity of tumor and normal epithelium after spraying gGlu-HMRG of all eight casesBack to article page