Twenty-one of these eGenes were detected only in GM and include genes with a role in diseases such as cancer (e.g. LUZP6 [33] PCDHB13 [34]) and obesity (e.g. NTRK2 [35]), narrowing down the list of genes that constitute promising candidates for further study. The gene discussed is PCDHB13; the disease is obesity due to melanocortin 4 receptor deficiency.