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