XIST and ossification of the posterior longitudinal ligament of the spine: What is important, none of the specific ncRNA that was found to be significantly dysregulated in OPLL (miR-10a, miR-563, miR-199b, miR-182, miR-615, miR-132, lncR MALAT1, and lncR XIST) was investigated in other types of HO or its animal model [28].