The ornamental twin-tail goldfish has a bifurcated caudal skeleton that arose during domestication, but the developmental mechanisms that generate this tail are unknown. Here, Abe et al. show that a mutation in the chordingene affects embryonic dorsal–ventral patterning causing the bifurcated tail skeleton.
- Gembu Abe
- Shu-Hua Lee
- Kinya G. Ota
