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Abstract

Segments in an embryo of the spider Cupiennius salei. The engrailed gene is expressed in segmentally iterated stripes (dark blue staining) and demarcates the parasegment boundaries. Parasegments are the initial segmental units in all arthropods and are an evolutionary conserved entity in arthropod embryogenesis. The limb primordia that are visible are the ones of the opisthosomal segments 4 and 5, and will form the spinnerets. The bright blue are the cell nuclei stained with DAPI. See Damen et al., Developmental Dynamics 236:1379–1391. © 2007 Wiley-Liss, Inc.