ERBB4 and Alzheimer disease: Inside the network, we found 2 differentially co-expressed genes with high degree, PPARG1A and ERBB4. While ERBB4 has been previously discussed, PPARGC1A helps decrease the generation of A\documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document}$$\beta$$\end{document}β and its levels are reduced in AD brains [37].