Correlation-based clustering of silk cuticular wax abundance data for inbred lines, B73 and Mo17. Rank-based Spearman correlations were calculated between all pairs of metabolites and used to construct the weighted correlation networks via weight gene correlation network analysis for A) B73 and B and C) Mo17. The nonclustered metabolites for B73 and Mo17 are shown in D and E) respectively. Pairs of lipid metabolites connected by edges are significantly correlated with correlation coefficients ≥0.5 and reside within the same cluster. Edge length represents correlation strength with shorter edges representing stronger correlations between metabolites. Nonclustered singleton metabolites were not statistically correlated with any other metabolites, or shared correlation values <0.5. Abbreviations: Alc, alcohol; Ald, aldehyde; FA, fatty acid; HC, hydrocarbon; VLCFA, very long-chain fatty acid.