Each of the autoimmune sera contained autoantibodies that reacted with a group of centrosomal proteins. We found that the centrosomal component ninein, first identified in mice, has a human homolog that is an autoantigen. Also, anticentrosomal sera contained antibodies to previously undetected centrosomal components. One of these novel antigens was identified and was designated Cep250. Thus, a characteristic of sera reactive with the centrosome is that they contain antibodies to a group of centrosomal proteins.
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