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Correlations between the effects of treatment mutations on mass and their effects on ΔM, Umin, and 
. Mass (measured relative to standard competitor genotypes reared in the same vials) was significantly correlated with ΔM (A) (ρ ∼ 0.82, P < 0.005) and with Umin (B) (ρ = −0.8, P < 0.01), but not with 
(C) (ρ ∼ 0.51, P > 0.1). Linear regression lines are shown for the two mutational properties ΔM and U that were significantly correlated with mass.
