FIG. 3.

Crystal violet staining of CRFK control cells (A) or CRFK cells infected with the supernatants of cultures that were mock transfected (B) or transfected with either RNA of FCV-infected cells (C) or RNA transcribed in vitro from the full-length clone pIK12 (D). The supernatants of the transfected cells were harvested 24 h posttransfection. The infected cells were fixed with formaldehyde 50 h postinfection and stained with crystal violet as described previously (19).