Each gene is analyzed separately using the linear mixed model [29–31] 1\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document} $$\begin{array}{@{}rcl@{}} y &=& \sum_{j} X_{j}\beta_{j} + \sum_{k} Z_{k} \alpha_{k} + \varepsilon \end{array} $$ \end{document}y=∑jXjβj+∑kZkαk+ε
