Summary
An electron microscopic investigation of human embryonic liver revealed the existence of undifferentiated mononuclear cells in the earliest stages of hepatic hematopoiesis. They were too immature to be classified as precursors of various hematopoietic series and were considered presumptively as hematopoietic stem cells. These cells were found exclusively in the intercellular spaces of hepatocytes and were thought to be derived from septum transversum.
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Fukuda, T. Undifferentiated mononuclear cell in human embryonic liver; presumptive hematopoietic stem cell. Virchows Arch. Abt. B Zellpath. 14, 31–34 (1973). https://doi.org/10.1007/BF02889171
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DOI: https://doi.org/10.1007/BF02889171