Affiliation: | (1) Institut für Mikrobiologie der J. W. Goethe-Universität Frankfurt, Theodor-Stern-Kai 7, Haus 75A, D-6000 Frankfurt am Main, Federal Republic of Germany;(2) Laboratory of Biochemistry, B. C. P. Jansen Institute, University of Amsterdam, P. O. Box 20151, 1000 HD Amsterdam, The Netherlands |