FIG. 7.

Schematic representation the SeV C proteins and their activities. The longer C proteins are shown as being composed of the Y protein module (large box) in which F170 is critical for all activities, plus an NH₂-terminal extension of either 23 (C^AUG114) or 34 (C′^ACG81) residues. The deletions within C^1–23 examined are indicated. The various activities of the C proteins are listed below in three groups distinguished by the phenotypes of the various mutant C genes examined. The numbers 1 to 23 and 10 to 15 refer to these residues within C^AUG114. For further explanation, see the text. The values for residues 1 to 23 were determined from the activity of the Y1 protein.