Fig. 6. SEU mRNA expression. (A) Northern analysis of mRNA isolated from flowers of wild-type and seu mutants. The doublet bands of SEU mRNA reflect two different transcriptional initiation sites confirmed by 5'RACE (see text). The relative mRNA level is corrected with the 18S RNA as a loading control and compared with wild-type signal level. (B) Northern analysis of mRNA isolated from leaves and flowers of wild-type plants. SEU mRNA is expressed at a higher level in flowers than in leaves.