File:Betasheet.jpg

Source:Wikimedia Commons

http://commons.wikimedia.org/wiki/Image:Betasheet.png

Picture of a beta sheet, an important motive of the secondary structure of proteins.

Humphrey, W., Dalke, A. and Schulten, K., "VMD - Visual Molecular Dynamics", J. Molec. Graphics, 1996, vol. 14, pp. 33-38.