Visual representation of molecular interactions in the TSF flock. The network was inferred using Ingenuity Pathway Analysis (IPA v01-13). The genes in the network included those with significantly different abundance between the resistant and susceptible lines in the TSF flock in response to a primary Haemonchus contortus infection for 3 days. Solid lines imply direct relationships between gene products while dotted lines imply indirect interactions. Red: the genes with a significantly higher abundance in the Resistant line than in the susceptible line. Green: the genes with a significantly lower abundance in the Resistant line than in the susceptible line. The degree of changes in gene abundance is represented by the intensity of the color.