Hi, Has anyone had any experience with trying to crystallize proteins containing an S-tag (RNase S-peptide)? thanks, mark -- Mark Knapp LLNL - BBRP Macromolecular Crystallography Group http://www-structure.llnl.gov Mail Stop L-452 Office: 510-422-5793 7000 East Avenue, PO Box 808 Fax : 510-422-2282 Livermore, CA 94550 email: knapp14 at llnl.gov