Notably, a transcriptional profile of HERV-W, LTR17, HERV-H, and HERV-K10 has been identified in the post-mortem brains of SZ and BD patients (Frank et al., 2005), and among all families, the HML-2 (HERV-K10) was the only consistently overrepresented in both groups. This evidence concerns the gene ERVW-1 and Behcet disease.