Annulate lamellae in an undifferentiated mouse marrow cell.
Annulate lamellae have been observed in undifferentiated cells in the marrow of mice treated with urethan. They were not found in any recognizable hematopoietic element in either urethan- or saline-injected controls. The possibility has been raised that this cytoplasmic organelle is confined to the most primitive marrow cell and may be an identifying feature of 'stem cells'.
Berman
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Department of Anatomy, University of Miami School of Medicine, Miami, Florida, U.S.A.
Stice
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