Schematic
diagram of a part of the T-DNA region of transformation vector piG 121Hm.
35S, 35S promoter of cauliflower mosaic virus; intron, the first intron of
catalase gene of caster bean, GUS, gene for I~-glucuronidase; HFF; gene for
hygromycin phosphotransferase; NOS; terminator of nopaline synthatase.