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. Author manuscript; available in PMC: 2014 Jan 1.
Published in final edited form as: Wiley Interdiscip Rev Dev Biol. 2012 May 25;2(1):97–112. doi: 10.1002/wdev.74

Figure 2.

Figure 2

A. Diagram depicting how repetitive primordia in different regions can serve as “modules” and assume different characteristics. Through a process akin to metamorphosis that occurs at the organ level they can develop into different ectodermal organs. Individually they undergo temporal cycling and as a population can form a regenerative wave. B. A peacock shows the stunning complex skin appendage pattern occurring in feather size, shape, arrangement, and pigmentation. These are also sexually dimorphic. Feather patterning uses all the module variation principles discussed here.