Antigen processing and presentation genes expressed in the head kidney of Atlantic salmon injected with different oil-based vaccines. qPCR expression studies of C-type lectin receptor (CLR), antigen recognition and processing by phagocytes (cathepsin D) and antigen presentation (CD209) genes identified as upregulated by microarray. FO-1 = A. salmonicida (sc); FO-2 = A. salmonicida (6 × sc); FO-7 = M. viscosa (sc); FO-8 = M. viscosa (6 × sc). Gene expression ratios normalized to EF1α. Error bars = SE, n= 7. *p < 0.05.