homoserine lactone(out) + H(+)(in) => homoserine lactone(in) + H(+)(out)
homoserine lactone(out) + h(+)(in) => homoserine lactone(in) + h(+)(out)
homoserine lactone(out) + H(+)(in) => homoserine lactone(in) + H(+)(out)
homoserine lactone(out) + h(+)(in) => homoserine lactone(in) + h(+)(out)