Patent ID: 6995014

Claim:
A plant cell containing: (a) nucleotide sequence encoding an immunoglobulin product comprising at least a portion of the variable region of an immunoglobulin light chain and a leader sequence forming a secretion signal, said immunoglobulin light chain obtained from an antigen-specific immunoglobulin comprising a heavy chain and the light chain, and; (b) immunoglobulin product encoded by said nucleotide sequence wherein said leader sequence is cleaved from said immunoglobulin light chain following proteolytic processing, said at least a portion of the variable region of an immunoglobulin light chain being capable of forming an antigen-specific immunoglobulin when co-expressed in said plant cell with said heavy chain from said antigen-specific immunoglobulin wherein said plant cell does not contain nucleotide sequence encoding an immunoglobulin heavy chain.