You are viewing a Web site, archived on 13:53:44 Nov 05, 2004. It is now a Federal record managed by the National Archives and Records Administration.
External links, forms, and search boxes may not function within this collection. Note that this document was downloaded, and not saved because it was a duplicate of a previously captured version (07:05:29 Nov 05, 2004). HTTP headers presented here are from the original capture.
PubMed Entrez BLAST OMIM Books TaxBrowser Entrez Structure
  Search Entrez  for

Cn3D 4.1 Homepage


Cn3D Tutorial

Cn3D feature highlights


Frequently Asked Questions

Cn3D Install

Installation and Configuration


NCBI's structure database


Taxonomy in MMDB


Structure comparisons

VAST Search

Submit structure database searches


Research topics and staff

Download Cn3D 4.1 for PC, Mac and Unix

Cn3D is a helper application for your web browser that allows you to view 3-dimensional structures from NCBI's Entrez retrieval service. Cn3D runs on Windows, Macintosh, and Unix. Cn3D simultaneously displays structure, sequence, and alignment, and now has powerful annotation and alignment editing features.

Below is a relatively simple sample of what Cn3D can do. There are many more examples in the Tutorial, along with instructions to help new users get started!

This example is a curated CD of the WD40 domain, which is a multi-functional 7-fold beta propeller. Cn3D is showing a representative protein structure, the family alignment, and annotation panels with information about annotated features of this protein family. Highlighted in both structure and sequence windows are the conserved residues in a pattern characteristic to this domain.

Download Cn3D 4.1 Now!


New Features in Cn3D 4.1:
  • Improved sequence alignment algorithms
  • Automatic VAST alignment import
  • Taxonomy viewer

New Features in Cn3D 4.0:

  • Re-written in C++ to improve performance and extendibility
  • Improved OpenGL rendering speed
  • New user interface using wxWindows
  • Complete alignment editing system, along with algorithms for constructing new alignments
  • Extensive structure and alignment annotation features
  • Detailed style control
  • High-resolution image export
  • Built-in help system



Updated 06/14/04

Privacy statement


Help Desk NCBI NLM NIH Credits