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Identification of oblique-gradient molecules in the chick retina. In situ hybridization of horizontal (left) and coronal (right) sections of E8 retinas. BMP2 (A), Tbx2 (B), Tbx3 (C), Tbx5 (D), ephrin-B1 (E), and ephrin-B2 (F) show a dorsotemporal-high expression. The higher side along the N-T and D-V axes was encircled.
