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Transcript abundance of lysine (A), arginine (B), and isoleucine (C) synthesis pathway genes in Portiera. The transcript abundance (2−ΔCt) of Portiera genes, relative to the normalizing gene RP7 is displayed (mean ± SE, three biological replicates). Different letters indicate significant difference. Data for a second normalizing gene, RP13, yielded similar results (see supplementary table S4B, Supplementary Material online).
