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Cn3D: A tool for visualization of three-dimensional structures with emphasis on interactive examination of sequence-structure relationships and superposition of geometrically similar structures. Can be used to display MMDB structures, superpositions of VAST similar structures, and conserved core motifs identified in conserved domains.

To install:


The Protein database is a collection of sequences from several sources, including translations from annotated coding regions in GenBank, RefSeq and TPA, as well as records from SwissProt, PIR, PRF, and PDB. Protein sequences are the fundamental determinants of biological structure and function.


On the first page there are links to Quickstart, Help, and FAQs.

Dates covered

Most recent information.

Updating frequency

As new information becomes available.


Published literature, protein sequences from databanks.


Type of coverage

Human/genetics/genomics information.

Print counterpart or
related resources

 Government reports, industry reports, white papers, books, journal articles, protein structure databanks.

Producer/content provider

National Center for Biotechnology Information (NCBI).

Vendor/electronic presentation provider

National Center for Biotechnology Information (NCBI)