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Abstract
A transient increase in terminal deoxynucleotidyl transferase positive (TdT+) cells was observed during the early phase of (less than or equal to day 5) cultures supporting the growth of pluripotent myeloid progenitor cells (CFU-mix). T-cell growth-promoting medium and erythropoietin were not required. The rapidity with which TdT+ cells appeared in cultures and the results of cultures where TdT+ cells were high initially (greater than 800 cells/culture) were not consistent with their having been produced by proliferation of pre-existing TdT+ cells from the bone marrow inoculum. The results suggest production of TdT+ cells from a TdT-negative precursor either by altered enzyme expression or by production of TdT+ progeny.
Published Version
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