Figure 1 (Left) Diagram of virion, showing a schematic representation of the composition of the coat and DNA covered by DNA-binding proteins; and superhelical DNA without covering protein molecules. (Right) Negative contrast electron micrograph of intact virus particle (on the left) and partially deteriorated particle exhibiting coat and core (on the right). The bar represents 100 nm.
Figure 2 Cla l restriction map of Thermoproteus virus 1 (TTV1) DNA, showing ORFs including the structural proteins of the virus and two regions, TPX and (PT)n containing (thr, pro)n repeats, between which recombination occurs frequently.
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