the fraction of granulocyte-macrophage colony-forming cells ( cfc ) in dna synthetic phase in blood from 25 normal adults and those in blood and bone marrow from 8 haematologically normal subjects were evaluated by in vitro culture of cells with and without prior exposure to 3h-thymidine ( 12.5 muci ) for 1 h at 37 degrees c .
C0018183
colony
C0005953
bone