Figure 2.

Possible cases of TSS usage among tissues. Possible cases of TSS usage sharing the same static structure of TSS: (a) TSS usage is identical between tissues X and Y; (b) upstream sites are favored in tissue X whereas downstream sites are favored in tissue Y; and (c) some subregions exhibit distinct TSS usage between tissues. The CAGE tag count of each tissue at each position is displayed as a vertical line, where the x-axis indicates genomic coordinates or chromosomal location and the y-axis indicates the CAGE tag count. bp, base pairs; CAGE, cap analysis of gene expression; TSS, transcription start site.