... in the presence orabsence of the b1Bsubunit, whereas, under the sameconditions, the rate of inactivation was increased in the presence of the b1subunit. The effects of b1Bwere furtherassessed ... the part of intron 3 adjacent to exon 3 (Fig. 1C and Table 1). As the site of divergence between the b1 and b1Bsubunit cDNAswas located precisely at the exon 3/intron 3 boundary of the SCN1B ... in Fig. 4A–D, the rates of activation and inactivation of the sodium current viaFig. 3. Immunohistochemical analysis of b1Bsubunit expression in human tissues. (A) The presence of b1Bin Purkinje...