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					             Bonellia viridis




http://www.unice.fr/LEML/coursJDV/images/animal/bonellie1-1.jpg
            Araschnia levana




 Spring morph                              Summer morph




http://www.leps.it/indexjs.htm?SpeciesPages/ArascLevan.htm
                    Nemoria arizonaria




E. Greene “A Diet-Induced Developmental Polymorphism in a Caterpillar” Science 243: 643 -646 (1989).
NIH report, “Stem Cells: Scientific Progress and Future Research Directions,” 2001.
NIH report, “Stem Cells: Scientific Progress and Future Research Directions,” 2001.
Morphogen gradients--Flatworm




      http://www.rzuser.uni-heidelberg.de/~bu6/Introduction03.html
           Morphogen gradient effects




J.B. Gurdon, S. Dyson, D. St. Johnston “Cells’ Perception of Position in a Concentration Gradient” Cell 95: 159 -162 (1998).

				
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