Better link with nice tutorial from Andrey is: www.ysbl.york.ac.uk/mxstat/ In the JLigand section there are some tutorials from Andrey to demonstrate how covalent links can be generated and used. Garib On 14 Jul 2010, at 14:35, Paul Emsley wrote: > On 14/07/10 12:56, Vandana Kukshal wrote: >> how to make covalent bond between ligand and protein residue by >> using CCp4 package > > JLigand > > http://www.ysbl.york.ac.uk/~pyoung/JLigand/JLigand.html > > p.s. Don't "Reply" if you are not following the same thread - doing > so causes confusion to threaded mail readers.