Temporal regulation of immune responses in PMCV infected fish. Box plots show log2-ER (expression ratios) for all genes included in the six gene sets (a-f) resulting from microarray analysis of infected versus control fish from the time course study in cardiac tissue. Boxes represent 50% of the values, while black bars mark the median log2-ER. Whiskers indicate the maximum length of 1.5 times the box length. Values beyond whiskers are plotted as circles. Significance levels of t-tests between time points are coded with asterisks: * = p-values between 0.01 and 0.05, ** = p-values < 0.01.