NCBI > Structure Home > 3D Macromolecular Structures > Cn3D > Downloading Cn3D 4.1 (previous release) for Mac

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Downloading Cn3D 4.1 (previous release) for Macintosh
 
 

System Requirements:

  • OSX 10.1 or higher.

Download Cn3D 4.1 here:

ftp://ftp.ncbi.nlm.nih.gov/cn3d/Cn3D-4.1.OSX.zip

Simply download the archive via this link, and extract it into a folder on your system, wherever you normally put application software, using your favorite zip archive application.

Once done, see the instructions for configuring your browser.

Mac OS 8/9 Users:

Cn3D 4.1 (and newer versions) will only run under OSX. For now, though, version 4.0 is still available, which has nearly all the features of 4.1 and runs on OS 8.6 or higher.

Download Cn3D 4.0 here:

ftp://ftp.ncbi.nlm.nih.gov/cn3d/old/4.0/Cn3D-4.0.0.sit

If you haven't already done so, you'll need to follow this link to download Apple's OpenGL extension libraries before you can run Cn3D 4.0, as it requires OpenGL.

Memory Requirements

If you have trouble running Cn3D 4.0 on Mac OS 8/9, especially on big or multiple structures, you may need to increase the amount of memory available for Cn3D:

  • select the Cn3D application and
  • go to "Get Info" in the Finder's File menu.
  • increase the preferred and minimum sizes by at least a factor of 2 (or more if your Mac has more memory).
 
 
Newer Versions of Cn3D
 
  Note that a more recent version of the program, Cn3D 4.3, is available and includes new features such as the ability to view biologically functional units that have been identified in 3D structures, crystallographic symmetry, stereo views, new alignment algorithms, new highlighting features, more robust handling of sequence identifiers, and communication with CDTree.  

 
 
 
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