Distribution of DGE tags across CATG sites within genes and gene numbers supported by DGE tags from different CATG sites. (a) japonica. (b) indica. (c) O. rufipogon. (d) O. nivara. For each panel, x-axis indicates CATG site positions from 3’-end of genes, while y-axis in left indicates the corresponding numbers of total tags mapped to different CATG positions and y-axis in right indicates the corresponding gene numbers supported by DGE tags mapped to different CATG sites.