This computer-generated image (hi-res version) shows a cross-section of a cell wall, with the inside of the cell below and the aqueous environment above. Theoretical biophysicists used a supercomputer to show how the aquaporin protein molecule forms channels that pass water molecules--the small blue "V"s--into the cell, but block protons (not shown). To find out more, see Precious Bodily Fluids.
Image:
image credit: Emad Tajkhorshid and Klaus Schulten, Theoretical and Computational Biophysics Group, Beckman Institute, University of Illinois at Urbana-Champaign; image source
