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Schematic representation of the 5' region of amphioxus HairyA, B, C and D genes showing conserved non-coding regions. These are named Box1 to 4 and shown in different colours. The small green oval represents a core region conserved in all four genes and located inside the conserved Box3 (yellow) present in all but the HairyB gene. Putative RBP-Jκ binding sites are shown as grey lines below each gene and are clustered within the conserved boxes.
