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About the Cover
Cover: Adult nymph and eggs of two-spotted spider mite Tetranychus urticae. This mite belongs to the class Chelicerata (horseshoe crabs, scorpions, spiders, ticks and mites) that is considered to be at the root of arthropod phylogeny, which represents the primitive state of the phylum. The two-spotted spider mite has transparent embryos, rapid embryogenesis and a small genome that make it a good candidate for a model chelicerate. Expression of T. urticae homologues of Drosophila pair-rule genes runt and paired show elements of conservation and divergence of pair-rule patterning relative to insects. For further details, see article by P. K. Dearden, C. Donly and M. Grbic in this issue, 5461-5472.
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