So, generally speaking, in six member sugar molecules, it's the beta animmer for the glucose that will predominate over the alpha one because of what we just discussed. So the beta anniversary of glucose is favored because all the groups lie along the less hindered equatorial side. Now, we not only have six memory rings in our body, we also have five member rings. And so we have fructose molecules that exist as five member rings. We also have ribose molecules. And ribose are very important because they're constituents of nucleic acids, DNA and RNA molecules.