Fig. 1
From: Revisiting operons: an analysis of the landscape of transcriptional units in E. coli
A diagram of TUC and different TU types: (a) TUs that span the entire DNA sequence covered by a TUC, referred to as full TUs; (b) starting TUs are the ones that begin with the first gene of their parent TUCs excluding (a); (c) terminal TUs are the ones that end with the last gene of their parent TUCs excluding (a); and (d) internal TUs are the ones that contain neither the first nor the last gene of their parent TUCs (see Fig. 1). TUs of (b) and (d) are called non-terminal TUs; and TUs of (c) and (d) are non-starting TUs. Blue bars represent genes, and each solid orange line represents a TU, and the dashed orange line in the bottom is a TUC