Illuminating a Biological Light Switch (IMAGE) Weill Cornell Medicine Caption Line-scanning high-speed atomic force microscopy measures the ‘firing’ of the bacteriorhodopsin protein at millisecond temporal resolution when the light is turned on. The bar at the bottom of the movie indicates light off (black) and light on (green). Image courtesy of Dr. Simon Scheuring and Dr. Alma Perez Perrino. Credit Image courtesy of Dr. Simon Scheuring and Dr. Alma Perez Perrino. Usage Restrictions None. License Original 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.