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