Expressional regulation of complement genes, E. coli infected udders or E. coli stimulated pbMEC. Genes with a ≥ 1.5-fold expression change are listed. Genes with a ≥ 2-fold expression change are in bold letters. Arrows indicate up- or down-regulation of mRNA abundance. Udders (infected) or pbMEC (stimulated) were both challenged for 24 h.