Polyploidization of megakaryocytes was studied in bone marrow aspirates from 3 patients with May-Hegglin anomaly by combined application of cytophotometric determination of the DNA content and autoradiography with 3H-TdR labeling in vitro. A marked elevation of the influx of progenitor cells into the megakaryocytic cell system as well as a decreased maturation capacity from type II to type III megakaryocytes was observed possibly contributing to the pathological platelet sequestration. The polyploidization activity as assessed by 3H-TdR labeling and nuclear DNA content was normal.

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