dense quiescent cultures of chick embryo fibroblasts infected by ny 68 virus ( ts mutant for transformation of rous sarcoma virus ) were stimulated to proliferate either by addition of growth factors in cultures maintained at 41 degrees c or by expression of transformation ( by the cell transfer from 41 to 37 degrees c , the permissive temperature for expression of transformation ) .
C0016030
fibroblasts
C0007634
cell