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ERK signaling controls the graded expression of neural mapping labels in the tectum. (A-L) In situ hybridization on sagittal sections of E14.5 brains of the indicated genotypes. The arrows indicate the expression gradient; the brackets show Etv5 expression in the posterior end of the tectum in A and the lack of Efna2 expression in D and L; the asterisks indicate the loss of Etv5 (E), restricted En2 (F) and ectopic Efna2 expression (H).
