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Helper application needed: Cn3D macromolecular structure viewer. Cn3D ("see in 3D") is a helper application for your web browser that allows you to view 3-dimensional structures.


Three dimensional structures provide a wealth of information on the biological function and the evolutionary history of macromolecules. They can be used to examine sequence-structure-function relationships, interactions, active sites, and more.

Dates covered

Most recent information.

Updating frequency

As new information becomes available.


Molecular Modeling Database (MMDB), VAST.


Type of coverage

Structure of molecules.

Producer/content provider

National Center for Biotechnology Information (NBCI)

Vendor/electronic presentation provider

National Center for Biotechnology Information (NCBI)