DUONG, T. D. and C. A. ERICKSON (2004) MMP-2 plays an essential role in producing epithelial-mesenchymal transformations in the avian embryo. Dev. Dyn., 229: 42-53.
HAMBURGER, V. and H. L. HAMILTON (1951) A series of normal stages in the development of the chick embryo. J. Morphol., 88: 49-92.