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Researchers led by the National Cancer Institute's Hisataka Kobayashi developed "a rapidly activatable, cancer-selective fluorescence imaging probe" to be sprayed onto suspect tissues, as they report in Science Translational Medicine. The probe is activated by with γ-glutamyltranspeptidase, which is found in cancer cells and not normal tissue. "The hope is that surgeons could apply it during or after a procedure to catch any cancer cells they might have missed," adds Erica Westly at Technology Review.