FIG 1.

Four different clades (indicated by I-IV) based on Pearson correlation of the transcription profiles of UCYN-A1 and UCYN-A2 genes over light-dark cycles. The transcription value of each gene at each time point was normalized to the mean at all time points and divided by the standard deviation (SD) (y axis, log 2 scale). The x axis represents time points where “D” and “L” stand for dark and light, respectively, followed by a number corresponding to the hour of entry into the light or dark period. The second light-dark cycle is indicated as “2D” followed by a number corresponding to the hour of entry into the light or dark period. The shaded area represents the dark period. In each cluster, the most representative genes are listed in the table attached to the plot. UCYN-A1 genes are coded in green and UCYN-A2 genes are coded in orange.