Hi, I have flexible a flexible loop in my structure and every time i refine it derange ramachandrans. Can anyone suggest how can i fix these flexible residues in phenix refinement so basically i don't wanna refine them. Can i do this in GUI? Thanks Raj The information contained in this transmission contains privileged and confidential information. It is intended only for the use of the person named above. If you are not the intended recipient, you are hereby notified that any review, dissemination, distribution or duplication of this communication is strictly prohibited. If you are not the intended recipient, please contact the sender by reply email and destroy all copies of the original message. CAUTION: Intended recipients should NOT use email communication for emergent or urgent health care matters.