Patent ID: 7005560

Claim:
A plant, comprising plant cells containing: a) nucleotide sequence encoding an immunoglobulin single polypeptide product comprising a single immunoglobulin polypeptide containing an immunoglobulin heavy chain, wherein said nucleotide sequence encodes a leader sequence forming a secretion signal for said single polypeptide product, said heavy chain obtained from an antigen-specific immunoglobulin comprising a heavy and light chain, and said single polypeptide product being capable of forming an antigen-specific immunoglobulin when co-expressed in a plant cell with said light chain from said antigen-specific immunoglobulin and wherein said plant cells do not contain nucleic acid encoding light chain; and b) immunoglobulin single polypeptide product encoded by said nucleotide sequence, wherein said leader sequence is cleaved from said single polypeptide product following proteolytic processing of said single polypeptide product.