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Electron micrographs were produced as described previously (19). Thin sections of A. vinelandii cysts formed by strains SMU88 (A), SMU88/pDMUM13 (B), ATCC 9046 (C), and ATCC 9046/pSMU865 (D) are shown. Abbreviations: EX, exine; IN, intine; CB, central body; PHB, poly-β-hydroxybutyrate. Bars, 0.4 μm.
