OPRM1 and neuropathy: Altogether, 13 genes were determined as Possibly related to CVS: CLCN1, KCNJ18, OPRM1, PRRT2, SCN1A (paroxysmal genes with 3–5 points, yellow, Table 2), GRM1 (DNTR/control gene with 11 points, per Discussion), KCNK18 (exome-wide search, potentially on-target, Table 5), GLS2 (exome-wide search, metabolic enzyme, 3 points, yellow, Table 5), GLA, KIF1B, INF2, PMP22, and SH3TC2 (exome-wide search, neuropathy associated, 3–5 points, yellow, Table 5).