Dear Jay, They may all be salt. However, compared to the effort of producing the protein and setting up the crystallization trials, testing the crystals in an X-ray beam is trivial. In your place, I would test them all, either on a home source or at the synchrotron. I have had one case when there were protein crystals and ammonium sulfate crystals in the same drop. You do not want to miss those protein crystals! Best, Herman
________________________________ From: CCP4 bulletin board [mailto:CCP4BB@JISCMAIL.AC.UK] On Behalf Of Jayashankar Sent: Sunday, May 29, 2011 11:18 PM To: CCP4BB@JISCMAIL.AC.UK Subject: [ccp4bb] salt or protein... Dear Friends , I need to know whether phosphate can form hexagon shaped crystals. In one particular condition i have 4 different pattern , 3 seems to me as salt crystals, except for the one... please find the attachment for the reference.. Thanks in advance Jay Institute for Biophysical Chemistry Hannover Medical School Germany.