TY - RPRT TI - Heart fields: one, two or more? AU - Radwan Abu-Issa AU - Karen Waldo AU - Margaret L Kirby PY - 2004 DO - 10.1016/j.ydbio.2004.05.016 UR - https://pubmed.ncbi.nlm.nih.gov/15282148/ ID - 15282148 ER -