Figure 4.
G:C capping of poly(dA:dT) tracts. (A) Illustrating the concept of poly(dA:dT) G:C capping. The poly(dA) strand preferentially terminates with G residues at both ends, while the poly(dT) strand preferentially terminates with C. The capping terminal is designated relative to the poly(dA) strand: GAn and TnC tracts, 5′ capping; AnG and CTn, 3′ capping. (B) G:C-capping rates at 5′ and 3′ termini over different tract lengths in promoter intergenic regions (from TSS to −150) and 3′ intergenic regions (nonoverlapping with promoter sequences).
