Analyses of interactions between the hexanucleotide element and multiple internal elements in vivo. (A,B) Accumulation of minus-strand RNA in protoplasts inoculated with full-length transcripts from wild-type, single element mutants, or multiple element mutants. Control reactions in lanes 1 and 2 are as described in the Figure 5 legend (panel C). Lanes 3 and 5 in panel A contain protected minus-strand RNA fragments from protoplasts inoculated with wild-type or p32 (replicase defective control), respectively. Products from protoplasts inoculated with single element mutants, Pol and CP8, are in lanes 4 and 6, respectively. Products from the TB8CP8 double element mutant and the PolTB8CP8 triple element mutant are in lanes 7 and 8. Similarly, panel B includes products from protoplasts inoculated with the single element mutant, TB2, (lane 5), double element mutant TB8CP8 (lane 6), and additional multiple element mutants, PolTB8CP8, TB8TB2CP8, and PolTB9TB2CP9 (lanes 7–9). (C) Quantitative representation of data in panels A and B.