Genes involved in the renin-angiotensin system (RAS) exhibiting differential expression between resistant and susceptible birds.

Genes are again specified as displaying either increased (+) or decreased (−) expression in resistant relative to susceptible birds. ACE1, ACE2, ENPEP and MME are crucial components of the renin-angiotensin system and all display significantly higher expression in resistant relative to susceptible birds, indicating increased activity of this pathway.