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Autoantibodies (AAb), typically detectable in sera of patients with systemic sclerosis (SSc), are more or less specific and directed against DNA topoisomerase I (Scl-70), centromeric (CENP-B) and nucleolar (fibrillarin, RNA polymerases, Th/To, PM/Scl) antigens and are found also in mixed connective tissue diseases or even before disease manifestation.1,2 In rare cases, AAb to cell cycle associated antigens of the centriole/centrosome, the nuclear mitotic apparatus, the stem body, the cleavage furrow, and the midbody region can be found.3–,5 In the mid-1980s two separate groups described anti-midbody antibodies (aMB) in five patients with SSc and in one patient with Raynaud’s syndrome.4,5 The target antigen(s) of aMB are still unknown proteins of the cleavage furrow and the midbody region of dividing cells and are detected by indirect immunofluorescence on tumour cell monolayer (HEp-2).
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