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Pax6 controls development of the epithalamus via regulation of MDO Shh function in zebrafish. (A-L’) Lateral and dorsal views of wholemount ISH for otx5(A-F’) and cxcr4b(G-L’) in 28 hpf zebrafish embryos of the indicated experimental procedure. Red arrows marks the cxcr4b positive habenula precursor cells. hpf, hours post-fertilization; ISH, in situ hybridization; MDO, mid-diencephalic organizer.
