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Gibson Department of Medicine Section of Infectious Diseases and Department of Microbiology Boston University School of Medicine Boston, MA 02118 USA Monique Gillis Laboratorium voor Mikrobiologie Universiteit Gent B-9000 Gent Belgium Stephen Giovannoni Department of Microbiology Oregon State University Corvallis, OR 97331 USA Frank Oliver Glöckner Max-Planck-Institut für Marine Mikrobiologie D-28359 Bremen Germany Ulf B.
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