by using bone marrow cells pretreated with 5-fluorouracil , cocultivation of cells for at least 4 days with virus producing fibroblasts , and addition of pokeweed mitogen stimulated spleen cell conditioned medium , from 30 to 100 % of haemopoietic spleen colony forming cells ( cfu-s ) could be infected .
C0016030
fibroblasts
C0007634
cell