Figure 4.

Schematic view of the interactions between different age/origin groups in the yeast protein physical interaction network. The age/origin groups are represented by nodes, with node size illustrating the group size, and the number of genes in each group in parentheses. The number of interactions between proteins of each group are given on the edges between group nodes, and are reflected in the edge width. The color of an edge indicates whether significantly more (red), fewer (blue), or an expected number (black) of interactions are observed in the network (see Figure 5).