Fig. 1.

Scatterplots of average normalized expression values. Probe sets to Toxoplasma genes were normalized as described in Materials and Methods, average values for replicate arrays were plotted, and the correlation coefficient (R²) was determined using Prism software. Samples corresponded to tachyzoites grown for 2 days on HFF cells (2d Tachy), bradyzoites that had been grown on HFFs for 4 days in vitro (4d Brady), and tissue cysts harvested from infected mouse brains 21 days after oral infection with oocysts (21d Brady). The comparisons are 21d Brady versus 4d Brady (A), 21d Brady versus 2d Tachy (B), and 4d Brady versus 2d Tachy (C).