dstn is expressed in anterior neural tissues and the epidermis during Xenopus embryogenesis. (A) Temporal expression of dstn analyzed by real-time qPCR at 9 landmark stages of embryonic development. (B) Spatial expression patterns of dstn were examined by whole-mount in situ hybridization (WISH). np, neural plate; an, anterior neural; ey, eye; ba, branchial arch; qPCR, quantitative polymerase chain reaction.