Quantitative RT-PCR expression results for genes responding to Myxobolus cerebralis infection in the skin tissue of both strains. A) Ubiquitin-like protein 1 is 100 – 134 fold up-regulated following pathogen exposure for both strains. B) Interferon regulating factor 1 (IRF-1) is up-regulated 16 – 18 fold up-regulated for both strains. C) Metallothionein B (MT-B) is up-regulated over 5 fold in the resistant Hofer but is unchanged in the susceptible Trout Lodge strain. Asterisks represent significance (** = P < 0.005; *** = P < 0.001). Abbreviations: HC = Hofer Control; HE = Hofer Exposed; TLC = Trout Lodge Control; TLE = Trout Lodge Exposed.