I was referring to Factor VIII von willebrands. Must be blind and not reading Roman numerals!! Gayle Callis MT,HT,HTL(ASCP) Research Histopathology Supervisor Veterinary Molecular Biology Montana State University - Bozeman PO Box 173610 Bozeman MT 59717-3610 406 994-6367 (lab with voice mail) 406 994-4303 (FAX)