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We use femtosecond laser pulses. We scan the skin and we get signals from the skin, particularly fluorescence, as well as another signal called second harmonic generation. So with these two signals we can build up images and get a precise look into the skin with a high resolution. The resolution is a factor of one thousand (times) better than ultrasound. So now you get the information without taking biopsies; normally you slice them, you stain them, and then a pathologist would look through these sections. Now you can get this information in seconds, labor free and with this fantastic resolution.