Distribution of vectors corresponding to different light and dark periods for two distinct hydrogenase genes. The vectors represent the log2 ratios of three time points for each corresponding 12 hour period. The vectors were plotted in a three-dimensional space, with axes corresponding to the 1st, 2nd, and the 3rd time points within a 12 hour period. (a) The gene cce_2318 shows a cyclic expression profile under alternating light and dark conditions and does not reveal significant changes during the subjective dark period. (b) The expression of the gene cce_1063 alters considerably under subjective dark. Red colored vectors represent the different light periods, Blue colored vectors correspond to the dark periods, and Green vectors indicate subjective dark.
Elvitigala et al. BMC Genomics 2009 10:226 doi:10.1186/1471-2164-10-226