Human CALHM1 Channel (IMAGE) Cold Spring Harbor Laboratory Caption Cryo-electron microscopy reveals that the human CALHM1 channel has an eight-protein assembly pattern, similar to that found in chickens. Note the number of colored arm-like structures above. The dot at the center of the image is ruthenium red, a chemical researchers use to block off the channel. Credit Furkawa lab/Cryo-EM Facility/Cold Spring Harbor Laboratory Usage Restrictions Attribution required 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.