“…The translation mechanism from this unusual mRNA has been studied in CaMV and figwort mosaic virus (another member of the caulimovirus group) by isolating and testing polar mutants and their revertants (Sieg and Gronenborn, 1982;Dixon and Hohn, 1984) and by expressing CaMV derivatives in vitro (Gordon et al, 1988) and in plant protoplasts Fütterer et al, 1988Fütterer et al, , 1989Fütterer et al, , 1990aFütterer et al, , 1990bBonneville et al, 1989;Gowda et al, 1989;Fütterer and Hohn, 1991;Scholthof et al, 1992). In summary, the results suggest that the translational machinery starts scanning at the cap site To whom correspondence should be addressed.…”