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