heart field specification secondary heart field specification biological_process 2009-09-22T03:47:56Z second heart field specification The process that results in the delineation of a specific region of the lateral mesoderm into the area which will form the majority of the mesodermal component of the right ventricle, arterial pole (outflow tract) and venous pole (inflow tract). GO:0003139 tb anterior heart field specification SHF specification