AY297843 10451 567 1002 CaMV 35S AY297843 10451 1003 6669 Potato virus X strain UK3 5'-sequence AY297843 10451 6670 6702 multiple cloning site AY297843 10451 6703 7654 Potato virus X strain UK3 3'-sequence AY297843 10451 7655 7934 Nos terminator AY297843 10451 7935 8102 shuttle vector pSK5640 sequence