*Gary Bader - Jan.28.2006 - I think there is a requirement in pathway drawing to have 2 edge types, one, like the neighbor node edge (node outside the child network linking to node inside the child network) and another type of edge, say meta edge, that links a node outside the child network to the metanode itself where the edge means that there is a relationship between an outside node and the entire child network.  One biological example is a connection from some protein (outside node) to a molecular complex (metanode), but you don't know exactly which subunit in in the complex is interacting.  The PATIKA and INOH papers have some nice cases illustrated.  Also, I will ask Emek Demir in our lab (who wrote PATIKA) if he can give us some hints.