Dear all CCP4 experts, Hello, I'm not molecular biologist and quite new in this field. I would like to know what companies (i.e. Sigma/Aldrich) are possibe for me to purchase purified protein samples. Any suggestion is welcomed. Many thanks in advance. stephen -- Dr. Stephen Sin-Yin Chui Research Assistant Professor, Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, China. Tel: 22415814 (Office), 22415818 (X-ray Diffraction Laboratory)