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The venation patterns characteristics of different insect orders and of families belonging to the same order possess enormous variation in vein number, position and differentiation. Although the developmental basis of changes in vein patterns during evolution is entirely unknown, the identification of the genes and developmental processes involved in Drosophila vein pattern formation facilitates the elaboration of construction rules. It is thus possible to identify the likely changes which maypmid:14756341 fatcat:pvfixwtqnrc3jl347f37d3ucua