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All patients had neonatal jaundice and severe anaemia (mean nadir haemoglobin: 6\u00b78\u2003g\/dl) at a mean age of 21\u2003d. The percentage of pyknocytes was 4\u201323%. Packed red blood cell transfusions were needed in 11 of 14 patients. Haemoglobin levels reached normal values within a mean time of 4\u2003months. Infantile pyknocytosis is an unusual cause of neonatal haemolytic anaemia, which requires careful examination of blood smears.<\/jats:p>","DOI":"10.1111\/j.1365-2141.2006.06033.x","type":"journal-article","created":{"date-parts":[[2006,3,14]],"date-time":"2006-03-14T09:06:33Z","timestamp":1142327193000},"page":"439-442","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":36,"title":["Infantile pyknocytosis: a cause of haemolytic anaemia of the newborn"],"prefix":"10.1111","volume":"133","author":[{"given":"St\u00e9phanie","family":"Eyssette\u2010Guerreau","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Brigitte","family":"Bader\u2010Meunier","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lo\u00efc","family":"Garcon","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"C.","family":"Guitton","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Th\u00e9r\u00e8se","family":"Cynober","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2006,4,11]]},"reference":[{"key":"e_1_2_6_2_1","first-page":"417","article-title":"Infantile pyknocytosis in Mexican\u2010American infants","volume":"117","author":"Ackerman B.D.","year":"1969","journal-title":"American Journal of Diseases of Children"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.1177\/000992287701600114"},{"key":"e_1_2_6_4_1","doi-asserted-by":"publisher","DOI":"10.1182\/blood.V61.5.899.899"},{"key":"e_1_2_6_5_1","doi-asserted-by":"publisher","DOI":"10.1097\/00043426-200208000-00021"},{"key":"e_1_2_6_6_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2141.1985.tb02976.x"},{"key":"e_1_2_6_7_1","first-page":"323","article-title":"Apropos of 3 new types of haemolytic anemia in children. 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