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  • Cell & Developmental Biology  (2)
  • 1975-1979  (1)
  • 1965-1969  (1)
  • 1
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Colony-forming cells (CFU), which have the general properties of hemopoietic “stem” cells, appear to be augmented in the mouse fetal liver from 12-18 days gestation and then decrease in the newborn. This finding suggests that few, if any, hemopoietic “stem” cells remain in the adult liver, an organ which appears to be unable to function erythropoietically, even at times of severe crises. In the spleen, and active adult as well as embryonic hematopoietic organ, the total number of CFU increases from 18 days gestation until at least 7 days after birth.Spleen and liver CFU augmentation seems to occur in cojunction with an analogous expansion of non-hematopoietic cells. The data suggests, in fact, that while there is an increase in the total number of liver CFU, there is also a dilution of liver CFU in the total cell population at successively later gestational ages.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Globin gene switching in sheep and goats has been used as a model system for examining gene expression in differentiating red blood cells. Sheep and goats switch from the synthesis of hemoglobin A to hemoglobin C in response to erythropoietin. The regulatory mechanism producing this switch in hemoglobin types could occur at the cellular, nuclear, or cytoplasmic level. Evidence is presented which suggests that regulation is occurring, in fact, at the nuclear level. Sheep and goat erythroid colonies have been grown in plasma clot culture in order to study the synthesis of individual globin chains. Erythropoietin is required for colony formation. The switch from hemoglobin A to hemoglobin C synthesis requires not only colony formation but also a higher concentration of erythropoietin than is required just for the production of colonies. A cell-free transcriptional system using bone marrow chromatin and mammalian DNA-dependent RNA polymerase has been developed in order to examine the nuclear control mechanisms in more detail.
    Additional Material: 21 Ill.
    Type of Medium: Electronic Resource
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