The pattern of segment formation, as revealed by engrailed expression, in a centipede with a variable number of segments.

Abstract excerpt

Arthropods vary enormously in segment number, from less than 20 to more than 200. This between-species variation must have originated, in evolution, through divergent selection operating in ancestral arthropod species with variable segment numbers. Although most present-day arthropod species are invariant in this respect, some are variable and so can serve as model systems. Here, we describe a study based on one...

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