approximately 70 % of the late erythroid progenitor cells ( e-cfu ) which are present in normal bone marrow are killed by exposure to high specific activity tritiated thymidine ( 3h-tdr ) in vitro or to hydroxyurea in vivo , indicating that a high proportion of these cells synthesize dna .
C2350175
erythroid progenitor cells
C0005953
bone marrow