choline(in) + n Na(+)(in) => choline(out) + n Na(+)(out)
choline(in) + n na(+)(in) => choline(out) + n na(+)(out)
choline(in) + n Na(+)(in) => choline(out) + n Na(+)(out)
choline(in) + n na(+)(in) => choline(out) + n na(+)(out)