The present invention is directed to a delivery vector for transferring a small peptide coding sequence to a cell for expression of the small peptide coding sequence within the cell. The delivery vector comprises a secretory signal sequence； a sequence encoding a carrier protein operatively associated with the secretory signal sequence； a sequence encoding a cleavage site operatively associated with the sequence encoding a carrier protein； and a sequence encoding a small peptide operatively associated with the sequence encoding a cleavage site.
