Figure 1 (IMAGE) Osaka University Caption This image depicts the principle of multiphoton excitation imaging technology. (a-b) In MPM technique, fluorescence is generated by excitation with multiple photons in the near infrared region, which have high tissue permeability (a). For these reasons, it is possible to observe deep regions from the surface (b). Credit Osaka University Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.