Tan et al. [205] screened the Mayo Clinic cohort of 292 unrelated SIDS victims for mutations in the four sodium channel β subunit genes SCN1B to SCN4B and identified a total of three mutations in two of these genes (SCN3B-V36M, SCN3B-V54G, and SCN4B-S206L). This evidence concerns the gene SCN4B and sudden infant death syndrome.