Gene expression changes in response to infection.

Mean and range of gene expression fold change of SAA2, SAA3, and SAA4 within liver, lung, and spleen tissues of infected pigs (n = 3) compared with control pigs (n = 3; mean gene expression for each isoform set to 1 for each tissue) from the two separate infection experiments. SAA4 was below detection limit in lung and spleen tissue.*SAA2 was below detection limit in the spleen of one of the AP-infected pigs, and the mean thus represents only two pigs.