“…Analysis of the nucleotide sequence of the genome of PLRV has identified six ORFs (Mayo et al, 1989;van der Wilk et al, 1989;Keese et al, 1990) which are thought to be expressed by a variety of strategies, including initiation at downstream AUG codons, shifting between reading frames during translation, suppression of termination codons and translation of subgenomic RNA containing downstream ORFs (Mayo et al, 1989;Bahner et al, 1990;Keese et al, 1990).…”