The integration of the Hrap gene was analysed using Southern
hybridization. The pBI-HRAP plasmid (10 pg) and genomic DNA
(10 mg) from eight transgenic plants were digested with HindIII,
which cut the plasmid DNA as shown in Fig. 4A. The HindIII
restriction enzyme has one cleavage site in the binary vector.
When integrated into genomic DNA, HindIII cut once at one end
of the promoter (outside the probe region) and again in the
genomic DNA beyond the T-DNA border.