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First page of Burgess AW, Wilson EMA, Metcalf D. Stimulation by human placental conditioned medium of hemopoietic colony formation by human marrow cells. <italic>Blood</italic>. 1977;49(4):<related-article id="ra1" related-article-type="companion" ext-link-type="pmc" vol="49" page="573" journal-id="0006-4971" journal-id-type="issn">573-583</related-article>.
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