highly significantp = 2.0 × 10 −4
1b ) revealed highly significant correlations of PC1 and PC2 with hepatic zones (PC1: r = 0.47, p = 2.0 × 10 −4 ; PC2: r = 0.86, p < 2.2 × 10 −16 , Supplementary Figure 3) indicating zonation as a major driver of variation between samples.