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Schematic representation of coordinated expression of Ciona Hox genes in the developing larval CNS and the juvenile gut. Expression domains of the Hox genes in the CNS in the tailbud stages (A) and in the gut of the juvenile (B) are shown schematically. The gut is drawn straightened to clearly indicate the anterior–posterior axis. gi, gill; es, esophagus; sv, sensory vesicle; oc, ocellus; os, oral siphon; ot, otolith; vg, visceral ganglion; nc, nerve cord; st, stomach; int, intestine.
