the effects of selected antitumor agents -- methotrexate , 6-mercaptopurine , cyclophosphamide , hydroxyurea and cytosine arabinoside on hemopoietic progenitor cells were determined by femoral and splenic colony forming cell ( cfc ) content after single and multiple injections of the agents .
C0018956
hemopoietic progenitor
C0007634
cell