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All the cell lines were grown long term in serum\u2010free medium. This BCDF\u2010like activity has a molecular mass in the range of 40\u201360 kDa and stimulates immunoglobulin synthesis of cell lines capable of producing IgA (GM\u20101056), IgG (GM\u20101500 and CESS) and IgM (CBL#3). It was not produced by a myeloid cell line. We were only able to identify the differentiation activity produced by the T and B cell lines by using appropriate molecular mass fractions from the serum\u2010free medium as controls. This BCDF\u2010like activity is different from that of the human BCDF so far described as it has a higher molecular mass and is constitutively produced by malignant T lymphoid cell lines which are human T cell leukemia virus\u2010I negative and by B lymphoblastoid cell lines.<\/jats:p>","DOI":"10.1002\/eji.1830170503","type":"journal-article","created":{"date-parts":[[2007,3,1]],"date-time":"2007-03-01T00:40:13Z","timestamp":1172709613000},"page":"593-598","source":"Crossref","is-referenced-by-count":7,"title":["Constitutive production of B cell differentiation factor\u2010like activity by human T and B cell lines"],"prefix":"10.1002","volume":"17","author":[{"given":"Susan","family":"Kanowith\u2010Klein","sequence":"first","affiliation":[]},{"given":"Andrew","family":"Saxon","sequence":"additional","affiliation":[]},{"given":"Christel H.","family":"Uittenbogaart","sequence":"additional","affiliation":[]}],"member":"311","published-online":{"date-parts":[[2005,11,17]]},"reference":[{"key":"e_1_2_1_2_2","doi-asserted-by":"publisher","DOI":"10.1084\/jem.155.3.914"},{"key":"e_1_2_1_3_2","doi-asserted-by":"crossref","first-page":"1104","DOI":"10.4049\/jimmunol.129.3.1104","volume":"129","author":"Muraguchi A.","year":"1982","journal-title":"J. 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