Dick et al (2010) [36] provided evidence for the involvement of 23 genes (NTSR2, TRIB2, PPM1G, MEM01, HAAO, MTIF2, CCDC139, EHBP1, BUB1, TTL, CKAP2L, MGAT5, ARHGAP15, KIAA1189, COBLLI, FAM130A2, LPR2, CHN1, PRKRA, PPP1R1C, LOC402117, IL8RA, FARP2) on chromosome 2 in alcohol dependence. Here, TTL is linked to alcohol dependence.