Hi ALL, This is the first structure I am working with. As the title said, I was stuck in the middle of model building using coot, and I found a big positive peak for Cadmium ion. The coot program doesn't *know* the cadmium ion when I add a Cd atom there (under the "place atom at pointer" menu--> "Other" ), and the refinement program doesn't *know* how to refine this (failed when I refine the whole structure, and it may need appropriate values as restraints, but I don't know how to add these values ).
So I am wondering any one can give me any suggestion about, how to add cadmium ion in the position and do the refinement. Thanks in advance, Lu