I am looking for plasmid pKK3535 which is a derivative of pBR322 containg rrnB ribosomal operon of E. coli. Does anyone know where I could obtain it? Thank you. -- Michael Casey Swiss Federal Dairy Research Institute 3097 Liebefeld Switzerland Tel: (+41) 31 323 81 79 FAX: (+41) 31 323 82 27 email Michael.Casey at mbox.fam.admin.ch