Is this density on an 2 fold axis? ________________________________________ From: CCP4 bulletin board [[log in to unmask]] On Behalf Of Sudhir Kumar [[log in to unmask]] Sent: 17 October 2012 12:07 To: [log in to unmask] Subject: [ccp4bb] unidentified density Dear all, I have been working on the crystal structure of an enzyme in which I found the unidentified density (see images in attachments). Crystallization condition has Peg 1000, Peg 1500, Ethylene glycol, Tris and MPD. Does any one has any idea what it could be? Thanks -- best regards Sudhir Kumar Research Scholar C/O Dr. S. Gourinath Structural Biology Laboratory SLS, JNU, New Delhi-110067