taurine(out) + H(+)(out) => taurine(in) + H(+)(in)
taurine(out) + h(+)(out) => taurine(in) + h(+)(in)
taurine(out) + H(+)(out) => taurine(in) + H(+)(in)
taurine(out) + h(+)(out) => taurine(in) + h(+)(in)