Fig. 3From: Observation of Zn-photoprotoporphyrin red Autofluorescence in human bronchial cancer using color-fluorescence endoscopySpectrogram of red autofluorescence observed in squamous cell carcinoma bronchial lesions with a wavelength of ca. 620 nm. Data were acquired using a modified PMA-12 (Hamamatsu Photonics, Japan)Back to article page