Ratios of interior to C-terminal protein isoforms for type IV transcripts with Ds1 insertion in a) rice and b) Arabidopsis. Data are mean ratios over all chromosomes (whiskers are range). Numbers shown on the base of each column indicated the integrated Ds1 message plus the duplicated target site (8 nucleotides). The remainder of each number divided by 3, i.e. 0, 1 or 2, determines the pattern of interior/C-terminal ratio in each Ds1 providing type.