FIG. 1.

Major f1 and IKe mRNAs and junctions between genes V and VII. RNAs marked with an asterisk are primary transcripts; the others are the 3′ products of processing by host endonucleases. The f1 mRNA diagram is the work of many authors (29). The IKe mRNAs, as recently defined, range in length from 470 to ∼2,000 nt (49). Coding regions are indicated by vertical lines. In the sequences (17, 33), gene V stop codons are overlined and SD sequences are underlined. Known (42) or potential start codons for gene VII are shown in boldface type, with the 5′ nucleotide of the f1 initiator AUG denoted +1.