To further investigate whether bacterial translocation into the mucosal EP induced an antibacterial immune response in the trout OM, we analyzed the transcript levels of antibacterial genes (lyz2, hp1, cath1, c3, cd209, lect2, nox1, and cmpk2) in the Cor, BC, and FC using LCM. The gene discussed is CMPK2; the disease is ocular melanoma.