Fig. 1
From: FoxB, a new and highly conserved key factor in arthropod dorsal–ventral (DV) limb patterning
Expression of FoxB genes in the developing limbs in Drosophila melanogaster (a–c dissected imaginal discs), Tribolium castaneum (d, e flat mounted embryos; anterior to the left; ventral view. e Inlay shows dissected legs), Glomeris marginata (f–i dissected limbs; anterior view), and Euperipatoides kanangrensis (j–l whole mount embryos; anterior to the left; j lateral view; k, l ventral view). Note that expression is always in the ventral sector of the ventral appendages, except for the arthropod labrum where expression is dorsal. Dorsal appendages, i.e., the wings and halteres in Drosophila do not express FoxB. Asterisks (*) mark dorsal tissue in ventral appendages. Arrows in b, c point to weaker (or no) expression in the very ventral region of the leg disc and the antennal disc. ad antennal disc, an antenna, ed eye disc, fap frontal appendage, hd haltere disc, hl head lobe, j jaw, L1/8 first and eighth walking limb, lb labium, ld leg disc, lr labrum, md mandible, mx maxilla, sp slime papilla, T1 first thorax segment, v/d ventral and dorsal side of leg, v ventral view on leg, wd wing disc