Map of the CCV genome showing the positions of viral DNA fragments contained in pPS7707 and pPS3927. (A) Representation of the CCV genome. The thick lines represent the terminal repeats; the thin line represents unique sequence. (B) Map showing positions within the terminal repeat of viral DNA fragments contained in pPS7707 and pPS3927. Abbreviations for restriction sites: A, Asp718; B, BamHI sites are shown only for pPS7707; C, ClaI; P, PstI; R, EcoRI; S, SalI, X, XbaI; B, BstEII sites are shown only for pPS3927.