How can one distinguish between a sulphate or phosphate in an electron density map? Both are present in the mother liquor, and resolution is in the range of 1.75 - 2.25 A -- ======================================================================= All Things Serve the Beam ======================================================================= David J. Schuller modern man in a post-modern world MacCHESS, Cornell University [log in to unmask] ######################################################################## To unsubscribe from the CCP4BB list, click the following link: https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=CCP4BB&A=1