nxph1 mRNA. Whole mounts are shown in lateral views (A, B). A1-A3: WISH transversal cryostat sections of a stage 72 hpf WT. B1-B3: WISH transversal cryostat sections of a stage 72 hpf mibhi904. Abbreviations (as above): PTd, dorsal part of posterior tuberculum; PTv, ventral part of posterior tuberculum. Scale bars: 0.2 mm (A, B), 0.1 mm (A1-A3, B1-B3).