More specifically, 17 out of 70 genes (HIST1H4K, HIST1H4L, MAOA, GNG12, HIST1H4A, NRAS, HIST1H4B, HIST1H4H, CALM3, HIST1H4J, HIST1H4C, CALM1, CALM2, HIST1H4D, HRAS, HIST1H4E and HIST1H4F) are involved in alcoholism pathway. Here, MAOA is linked to alcohol drinking.