Different patterns of nodes of origin for protein sequences grouped according to the number of nodes of origin of its constituent domains. The codes for different nodes are: A, archaea; B, bacteria; R, archaea+bacteria; E, eukaryota; T, metazoa; C, chordata; M, mammalia; P, Primates; H, Homo sapiens. Different groups of protein sequences are: (a) 1-node combination, (b) 2-node combination, (c) 3-node combination, (d) 4-node combination, (e) 5-node combination, (f) 6-node combination, (g) 7-node combination and (h) 8-node combination. In each group, number of colored boxes in each row represents the number of node combinations present in each protein sequence under that group, where the number of protein sequences in that node combination is given in the column denoted by '#' and percentage of those sequences out of total sequences in that group is given in the column denoted by '%'. Total number of sequences in each group with different node combinations is given in Figure 8.