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Bone marrow cells from five patients demonstrated a marked ability to form erythroid colonies in the presence of Epo. These studies also suggested that bone marrow cells from some patients may have an increased sensitivity to Epo. The most outstanding observation in the present study was the marked erythroid colony inhibition by serum taken from one patient during crisis. Serum taken from the same patient two months after hypoproliferative crisis had no suppressive effect on erythroid colony formation. Lymphocytes taken from three patients in crisis had a stimulatory effect on erythroid colony formation when included in culture. The conclusion is that the defect of erythropoiesis in sickle\u2010cell anemia during hypoproliferative crisis is not due to the absence of erythroid precursor cells or to the presence of suppressor lymphocytes, but may in some cases be associated with a circulating inhibitor of erythroid maturation.<\/jats:p>","DOI":"10.1002\/ajh.2830080103","type":"journal-article","created":{"date-parts":[[2007,2,21]],"date-time":"2007-02-21T05:48:11Z","timestamp":1172036891000},"page":"15-21","source":"Crossref","is-referenced-by-count":11,"title":["Erythroid colony studies on sickle cell anemia in hypoproliferative crisis"],"prefix":"10.1002","volume":"8","author":[{"given":"J. D.","family":"Lutton","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"E. A.","family":"Schmalzer","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A. N.","family":"Rao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"S. P.","family":"Rao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"R. 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