Partial Spearman's correlation between fitness pleiotropy and expression variation when each measurement is controlled.

ρ is Spearman's correlation coefficient and p-value is based on null hypothesis test that there is no statistically significant relationship between fitness pleiotropy and gene expression variation after controlling CRE, PPI degree or CC, i.e., the relationship between fitness pleiotropy and gene expression is explained by CRE, PPI degree or CC.