Table 1.

Primers used.

Primer	Sequence *
pln_Aat	GACTGACGTCTTCTAGACGGCTTCGGCAGCGAA
m4in_Sac	AACTGAGCTCGCTGTCCTCTTCGGCCAAGTTGT
op_combD	CTATGCCGGATGAGTGAACACTTACA
op_combR	TTCACTCATCCGGCATAGTGGCTCTCC
m4in_Aat	GACTGACGTCTAGATTTACTTCCAGCAAGC
m4in_combD	TGGCATAAACACTTACAACGGCTGATAAC
m4in_combR	GTTGTAAGTGTTTATGCCACCCCCACCTGAT
op_exR	GATTATTGGTCTGGTGTGCG
op_exD	AACATATTCACCAGTTAGCCG
m4in_exD	AGGCTTTCAAACGCAACTCGC
op_inR	TTGGGCATCTATTTCTTACG
op_inD	ACGAACTGGGCTATGAGG
m4in_inD	ATGAATCGCTGTCTGACG

* The Aat II sites are underlined, the Xba I sites are boldfaced, the Sac I site is italicized and boldfaced. The overlapping sequences are underlined with a double or wavy line. All primers were obtained from Evrogen (Russia).