Fig. 6

Capping boxes. Capping-box motifs with example structures and global and peak-cluster (*) motif data (Abundance/Overrepresentation/Pvalue). Exemplar widths are proportional to motif abundance in the corresponding cluster/geometry, while exemplar colour is proportional to overrepresentation. Both low resolution (3R/16C) and high resolution (4R/32C) maps are shown, with examples of both classic capping boxes (with solid green arrows) and big boxes (with dashed green arrows for the SC interaction from N3). The capping box and big box geometries form two distinct arms of a “pincer”, in which the capping box arm positions N” more towards (+z), while the big box arm positions it more towards (−z), setting up the N’ MCA for interaction with the N3 SC. These maps show that motifs with NCapT show substantially higher overrepresentation than those with NCapS