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Hints on Finding a Structure

New structure viewer About the Database
Cn3D is NCBI's 3D structure viewer. As a helper application for your Web browser, it allows you to interactively view 3D structures, sequences, and sequence alignments. Cn3D is available for Windows, MacOS, and Unix. More... The Molecular Modeling Database (MMDB) contains 3D macromolecular structures, including proteins and polynucleotides. MMDB contains over 40,000 structures and is linked to the rest of the NCBI databases, including sequences, bibliographic citations, taxonomic classifications, and sequence and structure neighbors.