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Plots of relative expression for each allele in the Artificial F1 (AF1) vs. True F1 (TF1) crosses. All crosses were generated from Marek’s disease resistant and susceptible lines of chicken. Expectations are pure cis-acting regulation will have a regression of one and lie along the 45° angle, while trans-acting regulation will fall off the 45° line for the (A) infected and (B) uninfected animals.
