The in vitro3H-TdR labelling index of eosinophil myelocytes in normal human bone marrow was 16.1%. A similar value was observed in with eosinophilia. Considerably higher – belling indices were seen in the eosinophil myelo- cytes of 1 folate deficient and 2 vitamin B12 deficient patients. Another 6 patients with megaloblastic haemopoiesis showed normal or near-normal eosinophil myelocyte labelling indices despite the presence of elevated labelling indices in the neutrophil promyelocyte-myelocyte pool in 5 of them. The results indicate some differences in the cytokinetic disturbances affecting neutrophil and eosinophil granulocytopoiesis.

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