1 2 3 4

		References Gilbert S. Developmental Biology: Ninth Edition. Sinauer Associates, Inc. Sunderland, 2010 pp 73-75. Miller J. & D. McClay. Characterization of the Role of Cadherin in Regulating Cell Adhesion during Sea Urchin Development. Developmental Biology. 1997, 192: 323-339. Sea Urchin Embryology, Stanford. < http://www.stanford.edu/group/Urchin/nathistory.html>.