**************************************************** Prof. Dr. rer. nat. Lothar Elling RWTH Aachen University Laboratory for Biomaterials Institute for Biotechnology and Helmholtz Institute for Biomedical Engineering Pauwelstrasse 20 D-52074 Aachen Germany Telefon: 241-80-28350/-24176 Telefax: 241-80-22387 e-mail: L.Elling@biotec.rwth-aachen.de Homepage: www.biotec-biomat.rwth-aachen.de