Required for maintaining the proliferative activity of embryonic cardiomyocytes by preventing premature activation of the negative cell cycle regulator CDKN1C/p57KIP and maintaining the required expression levels of cardiogenic factors such as MEF2C and NKX2-5. Acts as a ligand for ACVRL1/ALK1, BMPR1A/ALK3 and BMPR1B/ALK6, leading to activation of SMAD1, SMAD5 and SMAD8 transcription factors. Inhibits endothelial cell migration and growth. May reduce cell migration and cell matrix adhesion in breast cancer cell lines. {ECO:0000269|PubMed:16049014, ECO:0000269|PubMed:17068149, ECO:0000269|PubMed:20608934}. This is the function of BMP10 (bone morphogenetic protein 10, Ensembl gene identifier ENSG00000163217).