SCN8A and channelopathy: These new studies identify the FLPK tetrapeptide as a useful tool to probe Nav1.6 channel function and a scaffold for future drug development towards treatment of a wide range of channelopathies associated with Nav channels (Alshammari et al., 2016; Chahine et al., 2008; Di Re et al., 2017; Eijkelkamp et al., 2012; Hsu et al., 2017).