1. Bolender DL, Markwald RR (1979) Epithelial-mesenchymal transformation in chick atrioventricular cushion morphogenesis. Scanning Electron Microsc 3:313?321
2. Fitzharris TP (1981a) Origin and migration of cushion tissue in the developing heart. Scanning Electron Microsc II:255?260, 254
3. Fitzharris TP (1981 b) Endocardial shape change in the truncus during cushion tissue formation. In: Pexieder T (ed) Mechanisms of cardiac morphogenesis and teratogenesis, Raven Press, New York, pp 227?235
4. Hamburger, B, Hamilton HL (1951) A series of normal stages in the development of the chick embryo. J Morphol 88:49?91
5. Icardo JM, Ojeda JL, Hurle JM (1982) Endocardial cell polarity during the looping of the heart in the chick embryo. Dev Biol 90:203?209