An illustration of the protein cores derived from the CATH phylogenetic tree. Protein cores extracted from the tree in Figure 6 by cutting the tree at various levels. The domains shown are: (a) 1w4e and 1w4i (b) those domains shown in (a) and 2 eq9 and 1w85 (c) those domains shown in (b) and 1w4h, 1zwv, and 1zy8 (d) those domains shown in (c) and 1nvm and 2fna. Groups (a) through (c) are from class 4.10.320.10, while the domains included in (d) are from domain 18.104.22.168.
Shealy and Valafar BMC Bioinformatics 2012 13:105 doi:10.1186/1471-2105-13-105