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. 2015 Dec 7;112(52):15940–15945. doi: 10.1073/pnas.1521818112

Fig. 3.

Fig. 3.

Dual AERs in the developing paired fins of skates. (A–C) Wnt3 expression in the pectoral fin of skate at stage 29 (A) and 30 (B, ventral view; C, dorsal view). Wnt3 expression is a continuous strip in the ectoderm at stage 29, but splits into the anterior and posterior domain after stage 30. (D and E) Alcian Blue-stained skeletal preparations of skate embryos treated by DMSO or the WNT inhibitor IWR1. Pro- and mesopterygium were affected and shorter in IWR1-treated embryos compared with the control embryo. (F and G) Sagittal section of skate embryo at stage 30. An AER-like structure can be observed at the anterior tip of the pectoral fin (G).