Polypeptide producing cells

摘要

The current invention describes a nucleic acid comprising in a 5' to 3' direction a) a first nucleic acid encoding a heterologous polypeptide without an in frame stop codon, b) a second nucleic acid beginning with a 5' splice donor site and terminated by a 3' splice acceptor site comprising an in frame translational stop codon and a polyadenylation signal, and c) a nucleic acid encoding i) at least a fragment of a transmembrane domain, or ii) a signal peptide for a GPI-anchor.