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Summary of Hox expression domains in P. scaber. The main domains of expression in the ectoderm are shown in red: (A) lab is expressed in the second antennal segment and its appendages. (B) pb is expressed in the posterior second antennal segment. (C) Expression of Dfd is limited to the ventral mandibular segment and paragnaths. (D) Scr mRNA distribution in the first maxillary appendages, second maxillary segment, and appendages and distal half of T1 leg (24).
