OPRM1 and sudden infant death syndrome: Laer et al. have examined a SIDS cohort for single nucleotide polymorphisms (SNPs) in genes encoding some of the key modulators of respiratory control.31 They focused on known SNPs in different transmitter systems (41 genes) associated with respiratory control in a large SIDS cohort (366 cases).31 In certain subgroups of SIDS cases, they showed a significant association for two polymorphisms, one in the opioid receptor mu1 (OPRM1, subgroup: death occurring during autumn) and one in the sulfotransferase 1A1 (SULT1A1, subgroup: death occurring during summer).