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We describe a new electron microscopic on-section staining technique with high specificity and sensitivity for DNA-containing structures. Lowicryl HM20 sections of specimens obtained by cryofixation and freeze-substitution are incubated in a first step with a primary IgM antibody specific for double-stranded DNA. The layer of bound antibodies at the section surface is amplified in a successive step by a secondary IgG antibody. Finally, electron scattering of the antibody layer produced is enhanced by staining with a mixture of uranyl acetate and potassium permanganate. The applicability of the method is exemplified by the detection of shape and distribution of various types of bacterial and eukaryotic chromatin.

Immunostaining of DNA in electron microscopy: an amplification and staining procedure for thin sections as alternative to gold labeling.