the indication of the assignment of the acid-labile interferon to the leukocyte-type of interferon consists in the activity of bovine interferon in a heterologous culture of human diploid fibroblasts and a higher interferon titer in bone marrow than in spleen cells ( bone marrow cells contain b-cells which produce leukocyte interferon ) .
C0016030
fibroblasts
C0007634
cells