S-score heatmap of the yeast natural isolates across 34 conditions that were also used in the KO screening. B) Number of variants significantly associated (p-value < 1E-6) with phenotypic variation in each growth condition. C) Number of associated variants that overlap (i.e. are in a 3kbp window) with a conditionally essential gene in the same condition, in any of the four KO libraries. 