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- ArticleRitter MA.Immunology. 1978 Jan;34(1):69-75.The entry and subsequent division and differentiation of blood-borne stem cells within the embryonic thymus has been studied in a system where the inflowing cells were either chromosomally or antigenically marked. H-2 positive stem cells enter the thymus within 5 days of grafting but may wait for up to 14 days before proliferating to give rise to Thy-1 positive thymocytes.