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Coot is a graphics program for building, refining and analysing macromolecular models obtained with crystallographic procedures.
There is a [http://www.biop.ox.ac.uk/coot/ homepage] with extensive [http://www.biop.ox.ac.uk/coot/docs.html documentation]. The program may be downloaded for Linux, Mac and Windows computers from the [http://www.ysbl.york.ac.uk/~emsley/software/binaries/ primary server] or, if that is not available, from an [ftp://turn5.biologie.uni-konstanz.de/ external mirror].
License is GNU GPL.
=Assorted questions and answers (from the mailinglist)=
Q: How do I use "torsion general"?
A: Thanks for pointing out the lack of documentation on this. I'll make a note toadd some.
You need to click on the torsion-general icon, then click 4 atoms that describethe torsion - the first atom will be the base (non moving) part of the atomtree, on clicking the 4th atom a dialog will pop up with a "Reverse" button .
Move this dialog out of the way and then left mouse click and drag in the main
window will rotate the moving/"top" part of the residue round the clicked atoms
2 and 3. When you are happy, click "Accept".
Q: I have some peaks in my map which take water or sodium/magnesium or chlorine atom with out giving out any positive or negative density upon further refinement. Is there any easy way of calculating the peak height / number of electrons at a given position, say a mouse click point in coot? Is there any formula to calculate the number of electrons based on sigma level and peak height, as given in difference map peaks in coot?
A: First, go to the
coot wiki and pick up the scheme key bindings.
If you want density information at a given cursor point: point at the blob, press the 'g' key (which recentres on the biggest density under the cursor).
(apply density-at-point (imol-refinement-map) (rotation-centre))
There is no user access to the peak integration code of coot as yet.