highly significantP value <2 × 10 −6
The single exception is Prs3-F[1,2]:Fpr1-F[3], which displayed a small but highly significant fitness advantage (fitness=0.04, P value <2 × 10 −6 , Bonferroni corrected one-sided Student's t -test) that is perhaps due to an adaptive mutation that occurred in the parental PCA strain before barcoding.