cholate(in) + n H(+)(in) => cholate(out) + n H(+)(out)
cholate(in) + n h(+)(in) => cholate(out) + n h(+)(out)
cholate(in) + n H(+)(in) => cholate(out) + n H(+)(out)
cholate(in) + n h(+)(in) => cholate(out) + n h(+)(out)