The Institute for Molecular Biotechnology (Jena, Germany) provides this repository of molecular structures, featuring selected VRML (as well as two dimensional) images of "building blocks," and "macromolecular structures." Included among the images are RNA structures from the protein database at the Brookhaven National Laboratory, as well as over 250 DNA and protein structures. Sequence and descriptive information about the images is available. Non-VRML images are searchable.