the selectivity ratios through the ca channel with different cations were 2.7 ( ba ( 2+ ) ) :1.6 ( sr ( 2+ ) ) :1.0 ( ca ( 2+ ) ) and the m ( 2 ) form of the activation kinetics and the relationships between the time constant and the membrane potential were common to the three divalent cations.4 .
C0007447
cations
C0007448
divalent cations