Figure 1. Crosstalk between FGF and BMP Signaling Pathways during Proepicardial Differentiation.
Proepicardial cells, likely a heterogeneous population (as indicated by shading), differentiate down the cardiomyocyte lineage in response to BMP signaling or down a non-cardiomyocyte cardiac lineage in response to FGF signaling. Further, the FGF signaling pathway is dominant over the BMP pathway as FGF signaling through ERK can block BMP-induced cardiomyocyte differentiation.