Affiliation: | Service de Microbiologie, Faculte´de Me´decine, Institut de Botanique, Universite´de Lie`ge, Sart Tilman, 4000 Lie`ge, Belgium;Department of Biochemistry, Jefferson Medical College of Thomas Jefferson University, Philadelphia, Pa 19107, USA;The University of Liverpool, Department of Microbiology, Life Sciences Building, P.O. Box 147, Liverpool L69 3BX, Great Britain |