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Promoter cis-elements analysis of NtCCDs. Left panel, the unrooted neighbor-joining (NJ) evolutionary tree. Middle panel, the number of cis-elements in CCD promoter. Right panel, the schematic distribution of cis-elements. Some cis-elements may overlap with others. Different cis-acting elements were displayed with different-color boxes. a–n: the foreground branch labeled in the molecular evolution analysis followed.
