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Transmission electron micrograph of high-pressure frozen and cryosubstituted cell of Prosthecobacter dejongeii, immunogold labeled using anti-double-stranded DNA mouse monoclonal antibody and goat anti-mouse IgG bound to 10 nm-colloidal gold, showing labeling only over the condensed fibrillar nucleoid (white arrowheads) in the pirellulosome bounded by an intracytoplasmic membrane (ICM). Bar – 200 nm.
