The present invention relates to recombinant protein production in algalcells. Inparticular, the present invention provides methods for making recombinantpolypeptides in association with accumulated lipid particles or chloroplasts.Themethods involve producing the recombinant polypeptide as a fusion polypeptidewithan oil body protein and the growth of the algal cells under non-homeostaticconditions to form accumulated lipid particles within the algal cells, whereinthe algallipid particles contain the fusion polypeptide.