Patent ID: 7741536

Claim:
A stable plastid transformation and expression vector competent for stably transforming a target plastid genome, wherein said vector comprises an expression cassette comprising as operably linked components, in the 5′ to the 3′ direction of translation, a promoter operative in a plastid, a selectable marker sequence, a heterologous DNA sequence coding for Human Serum Albumin or an Human Serum Albumin fusion protein, a transcription termination region functional in said plastid, and, flanking each side of the expression cassette, flanking DNA sequences which are homologous to a DNA sequence comprising a transcriptionally active spacer sequence of the target plastid genome, whereby stable integration of the heterologous DNA sequence into the target plastid genome is facilitated through homologous recombination of the flanking DNA sequences with the homologous sequences in the target plastid genome.