[Secondary follicles in the thymus. Immunohistologic characterization of B lymphocytes using monoclonal antibodies].

Studies were conducted into the incidence of secondary follicles in individuals without autoimmune disease. Thymic tissue specimens were obtained from 20 children, aged between 6 months and 14 years who had undergone cardiac surgery and had been chosen at random. These specimens were immunohistologically investigated, using monoclonal anti-B cell antibodies (CD19 to CD23, CD37) and anti-immunoglobulin antibodies.