[biological_process] activin receptor signaling pathway <sep> apoptotic process <sep> cardiac epithelial to mesenchymal transition <sep> cellular response to growth factor stimulus <sep> endothelial cell activation <sep> heart development <sep> intracellular signal transduction <sep> mesenchymal cell differentiation <sep> nervous system development <sep> positive regulation of DNA-templated transcription <sep> positive regulation of endothelial cell proliferation <sep> positive regulation of gene expression <sep> regulation of epithelial to mesenchymal transition <sep> regulation of gene expression <sep> transforming growth factor beta receptor signaling pathway