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Regionalization of the head mesoderm in embryos of L. japonicum. Embryos at stages 19.5, 20, and 20.5 (Tahara 1988) are schematically illustrated. As in other vertebrate embryos, the head mesoderm of the lamprey is primarily regionalized by pharyngeal pouches (pp1 and pp2) and the otic vesicle (ot); real somitic boundaries arise only in the postotic paraxial mesoderm. Redrawn from Kuratani et al. (1999).
