Yi; $\overline{Y}$; Var(Yi)	Phenotype of individual i; mean phenotype; phenotypic variance
M ; N	Number of core genes; total number of genes
γj	Mean effect of a unit change in expression of gene j on Yi
xi,j; $\overline{x_j}$	Expression of gene j in individual i; mean expression of gene j
ϵYi	Random variation in Yi not mediated through core gene expression
Var(ϵYi)	Variance of random phenotypic effects (ϵYi)
Var(ϵxi,j); Cov(xi,j, xi,k)	Phenotypic variance of gene j; Phenotypic covariance of genes j and k
ϵxij	Random (nongenetic) variation in expression of gene j in individual i
I…L	Index over causal sites (loci)
Vj; Vj,cis; Vj,trans	Genetic variance for gene j; cis and trans genetic variances of j
Cj,k	Genetic covariance of genes j and k
Δl	Effect size of variant l on expression of gene j