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Fig. 4. Expression of {alpha}-OnmyTMLacZ in rainbow trout embryo at the stage of 39 somite pairs. (A) LacZ-positive cells were detected in somites (s) and the neural plate (np). (B) Reporter expression was seen in the neural crest (nc) on the border between the neural plate (np) and presomite mesoderm (psm). s, somite. (C) LacZ was expressed in mesencephalon (me) and neuromeres of the hindbrain (nm). mt, myotome; ysl, yolk syncytial layer. (D) Heart (h). (E) LacZ-positive cells were detected in the rest of the yolk syncytial layer (ysl).