Directed Acyclic Graph (DAG) of the enriched GO categories. The 115 gene probe sets differentially induced by IGFBP-rP1 were put to the gene ontology analysis. Shown is the result of DAG analysis, a directed graph with no directed cycles. The graph showed the significance of differently expressed genes and more specifically, the gene ontology terms present in numbers that are above random chance. P < 0.01 and at least 2 genes (which are colored red) and their non-enriched parents (which are colored black).