Relative expression levels of genes related to transcription in C2C12 cells treated with rhBMP2 and rhBMP7. Cells were seeded and grown for 24 h at which point the medium was replaced by DMEM containing 5% FCS in the presence or absence of rhBMP2 (200 ng/ml) or rhBMP7 (200 ng/ml). RNA was isolated 0, 4, 8, 12 and 24h after stimulation. Subsequently, expression levels were measured by quantitative real time RT-PCR. The asterisks correspond to the statistical analysis (two-way ANOVA, Bonferroni test) between control and treatment (*p < 0.05; **p < 0.01; ***p < 0.001).