Dear all, I am new to the CCP4 program for structure determination. Now I am trying to solve a complex structure with 2.5A resolution. I refined the structure with Refmac5 and built the model also using coot. Now I'm trying to insert the ligand molecule into the active site of electron density. But after refinement the entire ligand molecule is coming out from the electron density. If any one knows what the problem is and how to rectify this, it would be great. It would be helpful to finish my structure refinement. Thanks in advance. Regards, Sampath --------------------------------- It's here! Your new message! Get new email alerts with the free Yahoo! Toolbar.