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