Figure 2 highlights several clusters from data shown in Figure 1. The identifying names for the corresponding clusters within Figure 1 are listed as node numbers below. Pan B Cell: NODE1613X GCB Cell: NODE3184X T-cell-(large): NODE3649X Activated B cell: NODE2926X Proliferation-(large): NODE1671X Lymph node-(large): NODE2041X These specific nodes can be browsed and extracted from Figure 1 using TreeView, a freely available PC application (http://rana.stanford.edu/software). Simply select "Gene" under the "Find" menu, and search for the node of interest by typing the full node ID (e.g., "NODE1613X" without the quotes).