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The nuclear lamina is a karyoskeletal structure located at the periphery of cell nuclei. The major constituents are the lamins, which belong to the evolutionarily conserved multigene family of intermediate filament proteins. Lamins show a conspicuous cell type-specific expression pattern. The majority of somatic cells of vertebrates express A-type (lamins A and C) as well as B-type (lamins B1 and B2) lamins. Although a lamina structure has been demonstrated to be a ubiquitous component of somatic nuclei its existence in certain meiotic stages during spermatogenesis has been a matter of debate. In this study, we investigated the expression of lamins in rat spermatogenic cells using immunological and protein-chemical methods. We report on the presence of a nuclear lamina structure in rat pachytene spermatocytes. With the aid of a novel broad-reacting lamin antibody we have demonstrated the expression of a protein that is closely related, if not identical, to lamin B1.
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