Abstract
AbstractThe structure of hematopoietic marrow of the frog, Rana pipiens, was studied by electron microscopy. Lining cells of the sinus wall lack a basal lamina and are not phagocytic. Phagocytic cells of the marrow are found free in the lumina of sinuses and in the extravascular tissue. Heterophil leucocytes, during their differentiation, possess a single population of granules; mature granules are elongate bodies having a crystalline content. Eosinophil leucocytes also have a single population of granules; the granules are round and have a homogeneous content.
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