GetRegulatedNodes: get regulated nodes
In CausalR: Causal network analysis methods

This function will compute the nodes regulated by the given hypothesis gene and write the results to a file

1 2	GetRegulatedNodes(PPInet, Expressiondata, delta, hypothesisGene = "", signOfHypothesis = 1, outputfile = "")

`PPInet`	a protein-protein interaction network
`Expressiondata`	a table of observed gene expression data
`delta`	the number of edges to follow along the network. This should typically be between 1 and 5 dependent on network size/topology
`hypothesisGene`	the name of the hypothesis gene
`signOfHypothesis`	the sign of action expected from the hypothesis, +1 for up regulation, -1 for down
`outputfile`	the file to which the results should be written