Fluorescence Intensity Graph (image) California Institute of Technology Caption This graph represents a quantitative readout of the increases in fluorescence measured with the microscope as a stroke stimulus was applied to the animal's skin. Vertical yellow bars indicate periods when the stroke stimulus is applied and peaks in fluorescence coincide with the delivery of the stroke stimulus. Credit Anderson Lab/Caltech Usage Restrictions Okay with credit 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.