heart process | cell differentiation | blood vessel morphogenesis | pattern specification process | cellular process | cell junction assembly | heart contraction | cellular component organization | vasculature development | tube morphogenesis | cardiovascular system development | blood circulation | cellular component assembly | blood vessel development | anterior/posterior pattern specification | system development | multicellular organism development | anterior/posterior axis specification | vasculogenesis | heart development | regionalization | axis specification | anatomical structure development | cell-cell junction assembly | animal organ development | anatomical structure morphogenesis | developmental process | tube development | circulatory system development | multicellular organismal process | cell-cell junction organization