Sequence 2 from Patent WO9915684. Sequence 2 from Patent WO9915683. Sequence 2 from Patent WO0056910. Sequence 2 from patent US 6808922. Sequence 2 from patent US 7303910. Retrovirus vector containing functional splice donor site and functional splice acceptor site. Method. Retrovirus vector containing functional and non-functional splice donating sites and splice receiving sites. Retroviral vectors comprising functional and non-functionalsplice donor and splice acceptor sites. Retroviral vectors comprising a functional splice donor site anda functional splice acceptor site.
