AY297842 10436 567 1002 CaMV 35S AY297842 10436 1003 6669 Potato virus X strain UK3 5'-sequence AY297842 10436 6670 6687 multiple cloning site AY297842 10436 6688 7639 Potato virus X strain UK3 3'-sequence AY297842 10436 7640 7919 Nos terminator AY297842 10436 7920 8087 shuttle vector pSK5640 sequence