Fig. 3
From: Revisiting operons: an analysis of the landscape of transcriptional units in E. coli
Relations between TUCs and directons in the E. coli K12 genome. In (a), A represents the TUCs matching perfectly with their parent directons; B for the TUCs sharing exactly the 5’ boundary genes of their parent directons but; C for the TUCs sharing exactly the 3’ boundary genes of their parent directons; and D the TUCs located properly inside their parent directons. (b) The x-axis represents the number of TUCs per directon and the y-axis represents the number of directons containing k TUCs for k = 1, …, 8