[2] BrS4 600003 CACNB2 CaVβ2B – β-2 subunit of the voltage-gated calcium channel carrying the L-type calcium current ICa(L).[16] BrS5 600235 SCN1B NaVβ1 – β-1 subunit of the sodium channel carrying the sodium current INa.[16] BrS6 604433 KCNE3 MiRP2 – β subunit to voltage-gated potassium channels.