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...o wedges with typical "honeycomb" structure (Crandall & Gibson, 1998). The pathways between adjacent wedges are narrow and occasionally contain 1–3 dorsovent ...0.8 mm in diameter and has more elongate epithelial papillae and a thicker neural sheath 12–16 m across. There is no bulb region between anterior and poste

...s work in cooperation with Hox genes 21, 22. The developmental and genetic pathways proposed here suggest that the bizarre morphology of Foreyia (Fig.4) might