expression of this differentiation-defective phenotype is apparently coupled to an alteration in mitogen sensitivity : mm14 myoblasts require horse serum plus either chick embryo extract or fibroblast growth factor ( fgf ) to sustain cell growth : dd-1 variants are responsive to fgf , but also proliferate in response to serum alone or to reduced serum plus epidermal growth factor ( egf ) .
C0007589
differentiation
C0016026
fgf