Dendrogram of similarities between centralities in the vitamin PPI network. Some centralities provided similar rankings, indicating a degree of redundancy of these indices. Degree and betweenness measure local and global centrality of proteins, respectively, however they provide similar protein orderings (see the Table 1; row-B, column-D = 0.928). Moreover, their patterns of correlation with the other centralities tend to overlap. Topological importance up to one step is characterized by peculiar features and is closer to TI4 than to other indices. Closeness and eigenvector scores are grouped together.