Figure 3: Residue Indices, Aligned Covering Subsequences, and Loop Regions. The covering subsequence for the first two loop regions is depicted for RhA53GT and VvGT. The letters running along a horizontal axis indicate the residue subsequence. Shaded backgrounds indicate the loop regions within each covering subsequence. The location of a loop region is indicated by numerals giving the beginning and ending residue positions within the full sequence. The first five PCA indices are plotted in contrasting colors for each residue. A common scale is provided in the top left corner.